Robert Buxbaum is a life-long engineer, a product of New York's Brooklyn Technical High School, New York's Cooper Union to Science and Art, and Princeton University where he got a PhD in Chemical Engineering. From 1981 to 1991 he was a professor of Chemical Engineering at Michigan State, and now runs an engineering shop in Oak Park, outside of Detroit, Michigan. REB Research manufactures and sells hydrogen generation and purification equipment. He's married with 3 wonderful children who, he's told, would prefer to not be mentioned except by way of complete, unadulterated compliments. As of 2016, he's running to be the drain commissioner/ water resources commissioner of Oakland county.
My son works at a company called Homodeus. It’s part of 4Catalyzer, an umbrella of seven medical biotechnology companies with a staff of 300 scientists and engineers. One of the Homodeus products, still waiting FDA guidance is a COVID-19, RNA self-tester called Homodeus Detect. It tests for COVID RNA directly, not for antibodies, with tests are much faster than hospital tests, taking 45 minutes, but more complex than the unreliable test strips. So far, the Detect tests have shown no false positives or false negatives. That would suggest 100% reliable, except but there are a fair number of invalid tests. The invalid tests are lares due to the complexity, and also to the fact that you are testing snot, essentially. There is no blood-taking involved, unlike with the test strips, but just a nasal swab, and the cost is moderate, about $35 per test. However you have to do some lab work. After you swab your nose, you put the swab in a heated liquid bath where chemicals break up the snot and dissolve the shells on any viruses or pollen present. After 30 minutes, you pass the liquid onto a detector strip that contains a conjugate protein that binds to SARS-CoV-2 RNA. Your answer appears 15 minutes later as one of three lines: one for positive, one for negative, or one indicating an invalid test. Invalid tests show up more often than they like, about half the time, especially when the test is done by amateurs.
Getting an invalid test result is a downside of the current product, but I don’t think it should prevent sales. You get better at doing the test, and speed and lack of false positives and negatives is a bigger plus. It seems worthwhile to fast-track offer this test for doctors offices and hospital admissions, at least. I’d also like to see it used for airplane boarding and interstate travel, so that a person traveling might avoid the two week quarantine that many states impose. I’d certainly pay $200 or more to avoid a two-week quarantine, and if I have to do a second or third test, I’d do that too.
At least some people realize it’s a big advantage to know if you are currently infections.
Because this test measures virus RNA, and not antibodies, it indicates infection virtually as soon as you’re infected. That’s a benefit for those wishing to fly, or to meet with people, an advantage that is not lost on Elon Musk at least (see tweet). The test also shows negative as soon as the virus is gone, and that’s big. In recent months the FDA has fast-track approved an antibody indicating test from Abbott Labs, but that test has many false readings and only indicates infection several days afterward, and it does not indicate when you are no longer infectious.
The FDA has not offered to fast track this test, or any other like it for approval. They have not even indicated what sort of reporting and privacy requirements they want, so things sit in limbo, both for Homodeus, and for competing companies. Here is a story in USA today: https://www.usatoday.com/story/news/2020/07/29/fda-opens-door-rapid-home-covid-19-tests/5536528002. One big issue that the FDA is contact tracing. The FDA would like to be able to trace all the contacts of anyone who tests positive, while maintaining privacy as demanded by the 4th Amendment.
One way around the 4th amendment concerns would be to require anyone who uses the test to sign a waiver allowing the government to trace their contacts. Alternately there could be a block-chain enabled app that would come with the test. An app coms already providing a timer for when to move to the next step, and it includes a machine-vision system to help analyze dim lines on the indicator. Perhaps the FDA would accept block chain as a way to allow full reporting while maintaining privacy The FDA has yet to provide guidance on what they want, though. Without guidance or fast-track approval, things sit in limbo. Here is a scathing legal analysis from the Yale Law Journal.
You can get a free test, but have to do it at Homodeus headquarters in Guilford, Connecticut. It’s free, and results appears in about 45 minutes.. Homodeus has been manufacturing the test in quantity; if you are interested, use the following link to sign up: https://www.homodeusinc.com/research. Healthcare providers are particularly welcome.
Why did the FDA fast-track approve Abott’s antigen/ antibody test. Maybe because the tests rethought to not lead to lower mask use. Alternately, Abott has more political pull. You can read the FDA’s explanation here. In my biassed opinion the Homodeus product is good enough to fast track especially for hospitals and healthcare providers. It could save lives while allowing the economy to reopen.
Robert Buxbaum, November 15, 2020 (with massive help from Aaron M. Buxbaum)
A few days ago, I asked for and received the PCV-13 pneumonia vaccine, and a few days earlier, the flu shot. These vaccines are free if you are over 65, but you have to ask for them. PCV-13 is the milder of the pneumonia vaccines, providing moderate resistance to 12 common pneumonia strains, plus a strain of diphtheria. There is a stronger shot, with more side-effects. The main reason I got these vaccines was to cut my risk from COVID-19.
Some 230,00 people have died from COVID-19. Almost all none of them were under 20, and hardly any died from the virus itself. As with the common flu, they died from side infections and pneumonia. Though the vaccine I took is not 100% effective against event these 13 pneumonias, it is fairly effective, especially in the absence of co-morbidities, and has few side effects beyond stiffness in my arm. I felt it was a worthwhile protection, and further reading suggests it was more worthwhile than I’d thought at first.
It is far from clear there will be a working vaccine for SARS-CoV-2, the virus that causes COV-19. We’ve been trying for 40 years to make a vaccine against AIDS, without success. We have also failed to create a working vaccine for SARS, MERS, or the common cold. Why should SARS-CoV-2 be different? We do have a flu vaccine, and I took it, but it isn’t very effective, viruses mutate. Despite claims that we would have a vaccine for COVID-19 by early next year, I came to imagine it would not be a particularly good vaccine, and it might have side effects. On the other hand, there is a fair amount of evidence that the pneumonia vaccine works and does a lot more good than one might expected against COVID-19.
A colleague of mine from Michigan State, Robert Root Bernstein, analyzed the effectiveness of several vaccines in the fight against COVID-19 by comparing the impact of COVID-19 on two dozen countries as a function of all the major inoculations. He found a strong correlation only with pneumonia vaccine: “Nations such as Spain, Italy, Belgium, Brazil, Peru and Chile that have the highest COVID-19 rates per million have the poorest pneumococcal vaccination rates among both infants and adults. Nations with the lowest rates of COVID-19 – Japan, Korea, Denmark, Australia and New Zealand – have the highest rates of pneumococcal vaccination among both infants and adults.” Root-Bernstein also looked at the effectiveness of adult inoculation and child inoculation. Both were effective, at about the same rate. This suggests that the the plots below are not statistical flukes. Here is a link to the scientific article, and here is a link to the more popular version.
An analysis of countries in terms of COVID rates and deaths versus pneumonia vaccination rates in children and adults. The US has a high child vaccination rate, but a low adult vaccination rate. Japan, Korea, etc. are much better. Italy, Belgium, Spain, Brazil, and Peru are worse. Similar correlations were found with child and adult inoculation, suggesting that these correlations are not flukes of statistics.
I decided to check up on Root-Bernstein’s finding by checking the state-by state differences in pneumonia vaccination rates — information available here — and found that the two US states that were hardest hit by COVID, NY and NJ, have among the lowest rates of inoculation. Of course there are other reasons at play. These states are uncommonly densely populated, and the governments of both made the unfortunate choice of sending infected patients to live in old age homes. At least half of the deaths were in these homes.
Pneumonia vaccination may also explain why the virus barely affected those under 20. Pneumonia vaccines was available only in 2000 or so. Many states then began to vaccinate about then and required it to attend school. The time of immunization could explain why those younger than 20 in the US do so well compared to older individuals, and compared to some other countries where inoculation was later. I note that China has near universal inoculation for pneumonia, and was very mildly hit.
I also took the flu shot, and had taken the MMR (measles) vaccine last year. The side effects, though bad, are less bad than the benefits, I thought, but there was another reason, and that’s mimicry. It is not uncommon that exposure to one virus or vaccine will excite the immune system to similar viruses, so-called B cells and T-cell immunity. A recent study from the Mayo Clinic, read it here, shows that other inoculations help you fight COVID-19. By simple logic, I had expected that the flu vaccine would help me this way. The following study (from Root-Bernstein again) shows little COVID benefit from flu vaccine, but evidence that MMR helps (R-squared of 0.118). Let men suggest it’s worth a shot, as it were. Similar to this, I saw just today, published September 24, 2020 in the journal, Vaccines, that the disease most molecularly similar to SARS-CoV-2 is pneumonia. If so, mimicry provides yet another reason for pneumonia vaccination, and yet another explanation for the high correlations shown above.
As a final comparison, I note that Sweden has a very high pneumonia inoculation rate, but seems to have a low mask use rate. Despite this, Sweden has done somewhat better than the US against COVID-19. Chile has a low inoculation rates, and though they strongly enforced masks and social distance, it was harder hit than we were. The correlation isn’t 100%, and masks clearly do some good, but it seems inoculation may be more effective than masks.
Last night a CNN reporter was going around a Trump rally asking ‘When was America ever great?” It’s a legitimate question for anyone wearing a MAGA hat. “Make America Great AGAIN” suggests that America was once great and is no more. The answer the reporter pushed for, I think, was the one given by NY’s Governor Cuomo: “America was never that great.” Alternately, the answer of Michelle Obama, who claimed in 2008, “For the first time in my adult life, I am really proud of my country.” The attendees attempted other answers, like 1776, but the reporter shot them down, saying that people were enslaved in 1776, and telling the home audience that even later, women didn’t have the right to vote, or the LGBT community was denied the rights to which it was entitled. I was not there, and might have got shot down too, but I suspect the question deserves an exact answer: the last time America was great was just before October 24, 1945, United Nations Day, the day we submitted to be part of a world government.
Jackie Robinson, the first black American in major league baseball. Signed October 23, 1945.
By October 23, 1945 WWII was over. We had peace and plenty, the most powerful military, and the most powerful economy. Besides this, we had a baby boom (Children are a bedrock of success, IMHO). Also, on October 23, 1945, the Brooklyn Dodgers signed Jackie Robinson, the first black, major Leaguer since the late 1800s. We thus took a major step against the greatest of our original sins. These were aspects of US greatness, but they were were not guaranteed. They were based on two pre-requisites: a national dedication to self-improvement, and the sovereign control we had over our self-improvement. Total control ended on October 24, 1945 when we joined with the Soviet Union, the United Kingdom, China, France, and several other nations accepting (limited) control by the United Nations organization.
By accepting United Nations oversight, we gave over a significant chunk of sovereignty to other countries whose desire, mostly, was that the US should not be greater than them, and largely that it should not be great at all. To that end they endeavored to insure that we did not have the most powerful economy, the most powerful military, or a baby boom. From tat day on, other countries would sit in judgment on our behaviors and goals. More and more, they would demand remedies that served their interests and diminished US greatness, its exceptionalism. To the patriot this is a disaster. The New York Times declares that anti-exceptionalism is the road to world peace and prosperity. The MAGA crowd disagree.
The United Nations officially came into existence on October 24, 1945, after the United States, the Soviet Union, the United Kingdom, China, France ratify the UN Charter. The charter, once signed, was handed to Truman’s assistant, Alger Hiss.
It’s not that the MAGA Republicans are against world peace or prosperity. No sane person is, but they claim that the best way to achieve these things is for us to be exceptional and work in our own best interests. It is only a sad peace that is achieved by having a foreign body decide that we are at fault in every conflict, and that we should pay reparations to all who lag. There are many poor, socialist countries choosing judges, and these judges tend to rule that the US, as a rich nation, is always at fault and should always pay — both for “development” of the poor nations -overseen by them — and for the the UN too. We knew that their judges would rule this way, but likely didn’t care, or realize how much of our greatness rested on sovereignty. Without sovereignty, even the greatest of world powers will be brought down. Alger Hiss, the person Truman handed the signed UN charter to, was a spy for the Soviet Union. It was a telling beginning.
One of the big promises of Donald Trump is that he will limit the reach of the UN and of its ability to reach into our pockets. He already renegotiated or rejected trade agreements, like TPP that would have sent our jobs and technology abroad. Trump also placed import taxes (tariffs) on some foreign goods. The MAGA folks approve, but the Obama internationalists are scandalized. As depicted in the book “Fear”, long time (Obama) staffers at the White House stole tariff bills from the president’s desk to save the world by keeping them from Trump’s signature. Tariffs have been used throughout American history, and can be a benefit for jobs, and diplomacy and for American manufacturers. They are not radical, but some people lost out. Larely, those were US consumers of foreign goods who suffered. Things improved most for black and hispanic workers though. The intellectual class who claim to represent black and hispanic interests have removed Trump and supporters from social media. It’s their way of winning the argument.
Henry Cabot Lodge, Wilson’s main opponent ito the US joining the League of Nations,.
Trump also limited the power of the world trade organization and of the world court. It’s something that Henry Kissinger recommended In the Journal “Foreign Affairs 2001. Kissinger wrote that “The danger [in too much power for the world court] consists of substituting the tyranny of judges for that of governments; historically, the dictatorship of the virtuous has often led to inquisitions and even witch-hunts.” Trump also built up the military, and claims he will eliminate a postal agreement that gives low, subsidized rates, to China and poor countries so they can mail goods to the US for far less than we can to ourselves. Joe Biden has pushed for “the dictatorship of the virtuous” and promises to raise taxes to pay for it. He’s also suggested packing the supreme court. To me, this is far more radical than tariffs.
The MAGA divide between Trump and Obama/ Biden is not new. It’s existed to a greater or lesser extent between most Democrats and Republicans as far back as the civil war. One major cause of the civil war was tariffs. Then as now, tariffs benefit the manufacturer and worker, and hurt the aristocrat.
In 1918, the MAGA divide played flared because of Wilson’s support of the League of Nations. Republican, Henry Cabot Lodge opposed joining the League of Nations over the same complaints that Trump has raised. Trump’s MAGA claim is that he’ll make US agreements serve US interests. Also that he’s making the US military strong again, and making the US economy strong again. For all I know, the plan for the next four years is to try to ignite another baby boom, too. This, as I understand it, is the MAGA message.
As a side issue, I note that virtually every rapper is for Trump, and virtually every orthodox rabbi too. Yet the internationalist claim he’s racist. His approval among black voters is polled at 46%. Unless you hold that Jewish and black voters don’t understand their own interests. it would seem that Trump is not the racist he’s claimed to be. A recent, “jews for Trump” parade in NY was attacked with rocks, eggs, fists, and paint thrown on participants by white Democrats. The racists who run the NY Justice Department decided not to prosecute.
The hope diamond resides in the Smithsonian. It really is a deep blue. It has about 5 ppm boron.
If you’ve ever seen the Hope Dimond, or a picture of it, you’ll notice a most remarkable thing: it is deep blue. While most diamonds are clear, or perhaps grey, a very few are colored. Color in diamonds is generally caused by impurities, in the case of blue diamonds, boron. The Hope diamond has about 5 ppm boron, making it a p-semiconductor. Most blue diamonds, even those just as blue, have less boron. As it turns out one of the major uses of my hydrogen purifiers hydrogen these days is in the manufacture of gem -quality, and semiconductor diamonds, some blue and some other colors. So I thought I’d write about diamonds, colored and not, natural and CVD. It’s interesting and a sort of plug for my company, REB Research.
To start off, natural diamond are formed, over centuries by the effect of high temperature and pressure on a mix of carbon and a natural catalyst mineral, Kimberlite. Diamonds formed this way are generally cubic, relatively clear, and inert, hard, highly heat conductive, and completely non-conducting of electricity. Some man made diamonds are made this way too, using high pressure presses, but gem-quality and semiconductor diamonds are generally made by chemical vapor deposition, CVD. Colored diamonds are made this way too. They have all the properties of clear diamonds, but they have controlled additions and imperfections. Add enough boron, 1000 ppm for example, and the diamond and the resulting blue diamond can conduct electricity fairly readily.
Seeds of natural diamond are placed in a diamond growth chamber and heated to about 1000°C in the presence of ionized, pure methane and hydrogen.
While natural diamond are sometimes used for technical applications, e.g. grind wheels, most technical-use diamonds are man-made by CVD, but the results tend to come out yellow. This was especially true in the early days of manufacture. CVD tends to make large, flat diamonds. This is very useful for heat sinks, and for diamond knives and manufacturers of these were among my first customers. To get a clear color, or to get high-quality colored diamonds, you need a mix of high purity methane and high purity hydrogen, and you need to avoid impurities of silica and the like from the diamond chamber. CVD is also used to make blue-conductive diamonds that can be used as semiconductors or electrodes. The process is show in the gif above from “brilliantearth”.
Multicolored diamonds made by CVD with many different dopants and treatments.
To make a CVD diamond, you place 15 to 30 seed- diamonds into a vacuum growth chamber with a flow of methane and hydrogen in ratio of 1:100 about. You heat the gas to about 1000°C (900-1200°C) , while ionizing the gas using microwaves or a hot wire. The diamonds grow epitaxially over the course of several days or weeks. Ionized hydrogen keeps the surface active, while preventing it from becoming carbonized — turning to graphite. If there isn’t enough hydrogen, you get grey, weak diamonds. If the gas isn’t pure, you get inclusions that make them appear yellow or brown. Nitrogen-impure diamonds are n-semiconductors, with a band gap greater than with boron-blue diamonds, 0.5-1 volts more. Because of this difference, nitrogen-impure diamonds absorb blue or green light, making them appear yellow, while blue diamonds absorb red light, making them blue. (This is different from the reason the sky is blue, explained here.) The difference in energy, also makes yellow diamonds poor electrical conductors. Natural, nitrogen-impure diamonds fluoresce blue or green, as one might expect, but yellow diamonds made by CVD fluoresce at longer wavelengths, reddish (I don’t know why).
The blue moon diamond, it is about as blue as the hope diamond though it has only 0.36 ppm of boron.
To make a higher-quality, yellow, n-type CVD diamonds, use very pure hydrogen. Bright yellow and green color is added by use of ppm-quantities of sulfur or phosphorus. Radiation damage also can be used to add color. Some CVD diamond makers use heat treatment to modify the color and reduce the amount of red fluorescence. CVD pink and purple diamonds are made by hydrogen doping, perhaps followed by heat treatment. The details are proprietary secrets.
Orange-red phosphorescence in the blue moon diamond.
Two major differences help experts distinguish between natural and man-made diamonds. One of these is the fluorescence, Most natural diamonds don’t fluoresce at all, and the ones that do (about 25%) fluoresce blue or green. Almost all CVD diamonds fluoresce orange-red because of nitrogen impurities that absorb blue lights. If you use very pure, nitrogen-free hydrogen, you get clear diamonds avoid much of the fluorescence and yellow. That’s why diamond folks come to us for hydrogen purifiers (and generators). There is a problem with blue diamonds, in that both natural and CVD-absorb and emit red light (that’s why they appear blue). Fortunately for diamond dealers, there is a slight difference in the red emission spectrum between natural and CVD blue diamonds. The natural ones show a mix of red and blue-green. Synthetic diamonds glow only red, typically at 660 nm.
Blue diamonds would be expected to fluoresce red, but instead they show a delayed red fluorescence called phosphorescence. That is to say, when exposed to light, they glow red and continue to glow for 10-30 seconds after the light is turned off. The decay time varies quite a lot, presumably due to differences in the n and p sites.
Natural diamond photographed between polarizers show patterns that radiate from impurities.
Natural and CVD also look different when placed between crossed polarizers. Natural diamonds show multiple direction stress bands, as at left, often radiating from inclusions. CVD diamonds show fine-grained patterns or none at all (they are not made under stress), and man-made, compression diamonds show an X-pattern that matches the press-design, or no pattern at all. If you are interested in hydrogen purifiers, or pure hydrogen generators, for this or any other purposes, please consider REB Research. If you are interested in buying a CVD diamond, there are many for sale, even from deBeers.
Robert Buxbaum, October 19, 2020. The Hope diamond was worn by three French kings, by at least one British king, and by Miss Piggy. A CVD version can be worn by you.
You may know that engineers recently succeed in decreasing the tilt of the “leaning” tower of Pizza by about 1.5°, changing it from about 5.5° to about to precisely 3.98° today –high precision given that the angle varies with the season. But you may not know how that there were at least eight other engineering attempts, and most of these did nothing or made things worse. Neither is it 100% clear that current solution didn’t make things worse. What follows is my effort to learn from the failures and successes, and to speculate on the future. The original-tilted tower is something of an engineering marvel, a highly tilted, stone on stone building that has outlasted earthquakes and weathering that toppled many younger buildings that were built straight vertical, most recently the 1989 collapse of the tower of Pavia. Part of any analysis, must also speak to why this tower survived so long when others failed.
First some basics. The tower of Pisa is an 8 story bell tower for the cathedral next door. It was likely designed by engineer Bonanno Pisano who started construction in 1173. We think it’s Pisano, because he put his name on an inscription on the base, “I, who without doubt have erected this marvelous work that is above all others, am the citizen of Pisa by the name of Bonanno.” Not so humble then, more humble when the tower started to lean, I suspect. The outer diameter at the base is 15.5 m and the weight of the finished tower is 14.7 million kg, 144 million Nt. The pressure exerted on the soil is 0.76 MPa (110 psi). By basic civil engineering, it should stand straight like the walls of the cathedral.
Bonanno’s marvelous work started to sink into the soil of Pisa almost immediately, though. Then it began to tilt. The name Pisa, in Greek, means swamp, and construction, it seems, was not quite on soil, but mud. When construction began the base was likely some 2.5 m (8 feet) above sea level. While a foundation of clay, sand and sea-shells could likely have withstood the weight of the tower, the mud below could not. Pisano added length to the south columns to keep the floors somewhat level, but after three floors were complete, and the tilt continued, he stopped construction. What to do now? What would you do?
If it were me, I’d consider widening the base to distribute the force better, and perhaps add weight to the north side. Instead, Pisano gave up. He completed the third level and went to do other things. The tower stood this way for 99 years, a three-floor, non-functional stub.
About 1272, another engineer, Giovanni di Simone, was charged with fixing the situation. His was the first fix, and it sort-of worked. He strengthened the stonework of the three original floors, widened the base so it wold distribute pressure better, and buried the base too. He then added three more floors. The tower still leaned, but not as fast. De Simone made the south-side columns slightly taller than the north to hide the tilt and allow the floors to be sort-of level. A final two stories were added about 1372, and then the first of the bells. The tower looked as it does today when Gallileo did his famous experiments, dropping balls of different size from the south of the 7th floor between 1589 and 1592.
Fortunately for the construction, the world was getting colder and the water table was dropping. While dry soil is stronger than wet, wet soil is more plastic. I suspect it was the wet soil that helped the tower survive earthquakes that toppled other, straight towers. It seems that the tilt not only slowed during this period but briefly reversed, perhaps because of the shift in center of mass, or because of changes in the sea level. Shown below is 1800 years of gauge-based sea-level measurements. Other measures give different sea-level histories, but it seems clear that man-made climate change is not the primary cause. Sea levels would continue to fall till about 1750. By 1820 the tilt had resumed and had reached 4.5°.
The 2nd attempt was begun in 1838. Architect, Alessandro Della Gherardesca got permission to dig around the base at the north to show off the carvings and help right the tower. Unfortunately, the tower base had sunk below the water table. Further, it seems the dirt at the base was helping keep the tower from falling. As Della Gherardesca‘s crew dug, water came spurting out of the ground and the tower tilted another few inches south. The dig was stopped and filled in, but he dig uncovered the Pisano inscription, mentioned above. What would you do now? I might go away, and that’s what was done.
The next attempt to fix the tower (fix 3) was by that self-proclaimed engineering genius, Benito Mussolini. In 1934. Mussolini had his engineers pump some 200 tons of concrete into the south of the tower base hoping to push the tower vertical and stabilize it. The result was that the tower lurched another few inches south. The project was stopped. An engineering lesson: liquids don’t make for good foundations, even when it’s liquid concrete. An unfortunate part of the lesson is that years later engineers would try to fix the tower by pumping water beneath the north end. But that’s getting ahead of myself. Perhaps Mussolini should have made tests on a model before working on the historic tower. Ditto for the more recent version.
On March 18, 1989 the Civic Tower of Pavia started shedding bricks for no obvious reason. This was a vertical tower of the same age and approximate height as the Pisa tower. It collapsed killing four people and injuring 15. No official cause has been reported. I’m going to speculate that the cause was mechanical fatigue and crumbling of the sort that I’ve noticed on the chimney of my own house. Small vibrations of the chimney cause bits of brick to be ejected. If I don’t fix it soon, my chimney will collapse. The wet soils of Pisa may have reduced the vibration damage, or perhaps the stones of Pisa were more elastic. I’ve noticed brick and stone flaking on many prominent buildings, particularly at joins in the chimney.
John Burland’s team cam up with many of the fixes here. They are all science-based, but most of the fixes made things worse.
In 1990, a committee of science and engineering experts was formed to decide upon a fix for the tower of Pisa. It was headed by Professor John Burland, CBE, DSc(Eng), FREng, FRS, NAE, FIC, FCGI. He was, at the time, chair of soil mechanics at the Imperial College, London, and had worked with Ove, Arup, and Partners. He had written many, well regarded articles, and had headed the geological aspects of the design of the Queen Elizabeth II conference center. He was, in a word, an expert, but this tower was different, in part because it was an, already standing, stone-on stone tower that the city wished should remain tilted. The tower was closed to visitors along with all businesses to the south. The bells were removed as well. This was a safety measure, and I don’t count it as a fix. It bought time to decide on a solution. This took two years of deliberation and meetings
In 1992, the committee agreed to fix no 4. The tower was braced with plastic-covered, steel cables that were attached around the second and third floors, with the cables running about 5° from the horizontal to anchor points several hundred meters to the north. The fix was horribly ugly, and messed with traffic. Perhaps the tilt was slowed, it was not stopped.
In 1993, fix number 5. This was the most exciting engineering solution to date: 600 tons of lead ingots were stacked around the base, and water was pumped beneath the north side. This was the reverse of the Mussolini’s failed solution, and the hope was that the tower would tilt north into the now-soggy soil. Unfortunately, the tower tilted further south. One of the columns cracked too, and this attempt was stopped. They were science experts, and it’s not clear why the solution didn’t work. My guess is that they pumped in the water too fast. This is likely the solution I would have proposed, though I hope I would have tested it with a scale model and would have pumped slower. Whatever. Another solution was proposed, this one even more exotic than the last.
For fix number 6, 1995, the team of experts, still overseen by Burland, decided to move the cables and add additional tension. The cables would run straight down from anchors in the base of the north side of the tower to ten underground steel anchors that were to be installed 40 meters below ground level. This would have been an invisible solution, but the anchor depth was well into the water table. So, to anchor the ground anchors, Burland’s team had liquid nitrogen injected into the ground beneath the tower, on the north side where the ground anchors were to go. What Burland did not seem to have realized is that water expands when it freezes, and if you freeze 40 meters of water the length change is significant. On the night of September 7, 1995, the tower lurched southwards by more than it had done in the entire previous year. The team was summoned for an emergency meeting and the liquid nitrogen anchor plan was abandoned.
Tower with the two sets of lead ingots, 900 tons total, about the north side of the base. The weight of the tower is 14,700 tons.
Fix number 7: Another 300 tons of lead ingots were added to the north side as a temporary, simple fix. The fix seems to have worked stabilizing things while another approach was developed.
Fix number 8: In order to allow the removal of the ugly lead bricks another set of engineers were brought on, Roberto Cela and Michele Jamiolkowski. Using helical drills, they had holes drilled at an angle beneath the north side of the tower. Using hoses, they removed a gallon or two of dirt per day for eleven years. The effect of the lead and the dirt removal was to reduce the angle of the tower to 4.5°, the angle that had been measured in 1820. At this point the lead could be removed and tourists were allowed to re-enter. Even after the lead was removed, the angle continued to subside north. It’s now claimed to be 3.98°, and stable. This is remarkable precision for a curved tower whose tilt changes with the seasons. (An engineering joke: How may engineers does it take to change a lightbulb? 1.02).
The bells were replaced and all seemed good, but there was still the worry that the tower would start tilting again. Since water was clearly part of the problem, the British soils expert, Burland came up with fix number 9. He had a series of drainage tunnels built to keep the water from coming back. My worry is that this water removal will leave the tower vulnerable to earthquake and shedding damage, like with the Pavia tower and my chimney. We’ll have to wait for the next earthquake or windstorm to tell for sure. So far, this fix has done no harm.
Robert Buxbaum, October 9, 2020. It’s nice to learn from other folks mistakes, and embarrassments, as well as from their successes. It’s also nice to see how science really works, not with great experts providing the brilliant solution, but slowly, like stumbling in the dark. I see this with COVID-19.
Today, Michigan and several other, Democrat-run states are in fairly broad COVID lockdown. The justification for this is that it is “THE science”, as if this were the only possible behavior if you believe the disease is deadly and contagious. The other fellows, the governors of Republican-run states are framed as deniers of the science. Strangely enough, although this disease is most -definitely contagious and deadly, killing 209,000 Americans so far, about 0.064% of the US this year, it is far from clear that a broad lockdown is the only way to stop the disease. Sweden avoided a general lockdown, leaving its schools and restaurants open, and has seen the disease follow an almost destructive path to that of the US, with a death rate that is currently slightly lower than ours. See the excess death plot below. Sweden seems to have avoided a second, summer spike.
Mortality is Sweden vs the US; Ignore the last 2-3 weeks, it takes time for this data to be compiled
It’s bad enough for “THE SCIENCE” when you see the anti-science, no-lockdown solution provide the same result, or close. Earlier in the summer I noted that Sweden and Michigan had near the same outcome, with Sweden slightly better. It’s now the case that Sweden is doing better than the US, and much better than the D-lead lockdown states. The highest six death rate states are all D-lead, lockdown states, NY, NJ, Mass, Conn, LA, and RI, and rates are double the US average in New York and New Jersey. Perhaps the solution is a general opening, like in Sweden, but before we rush to this, it’s probably worthwhile to do some re-thinking.
Deaths per week, under 18. Any excess deaths caused by COVID-19 are invisible here, lost in the scatter.
One thing that Swedes seem to have appreciated that the US experts didn’t is that the disease hardly affects those the under 18, and that’s basically the entire K-12 student body. Sweden therefore left their K-12 schools open, while we closed ours in the US beginning in early April. At right I’ve plotted the US deaths per week for under 18 for the last three years, that is from before COVID till now. There is no evidence of excess COVID-19 deaths for this group. If anything anything, the under 18 death death rate is lower after COVID than before. This resistance of this group helps explain part of why the Swedish approach didn’t cause increased deaths. Kids in Sweden got the disease, but didn’t die of it, and likely infected their parents. The Swedes didn’t bother trying to protect everyone, but only the most vulnerable, the old people. Sweden was not completely successful at this, but we were perhaps worse, despite the general lockdown.
The excess deaths US for the 65+ bracket plotted by week of the year for 2020 (blue), 2019 (grey) and 2018 (yellow). Nearly 200,000 of the excess deaths of 2020 — the vast majority — are in this age bracket.
But what about the middle-age people that the kids would have infected, the parents and teachers. For middle age people, those in the 18-65 range, it seems to make a difference how physically fit you are, and the Swedes tend to be fit. Obesity is a big co-morbidity for this disease, and Americans tend to be obese, with things getting worse during the lockdown. Swedes also wash their hands more than we do (or so is their reputation) and they go out in the sun. There is evidence that the sun helps, and vitamin D too. A stark way of seeing how much fitness helps, for even those over 18 is to consider that, of the 1.3 million men and women of the US military, there have been only 7 COVID deaths. That is a rate 1/100 of the national average for a population that is entirely over 18. This is not to say that the death rate is quite 5 per million, (7/ 1.3 million = 5 per million), but it’s probably below 50 per million. That is to say, at least 10% of the military was likely infected.
I’m inclined to agree with Dr. Fauchi that we are not yet at herd immunity, or even close, even in states like Michigan where death rates have leveled out. Only 20% of the state shows antibodies and real herd immunity would require 75% or so. Further supporting this, our death rates are 1/2 that of New Jersey. If we were at herd immunity, that could not have happened. It is possible though that we have a sort of pseudo herd immunity, where many people in the MI population have some level of T-cell immunity. T-cells do a good job eating disease (here’s a video) but they get overwhelmed when we are exposed to more than a low dose of virus. This dose-response is common in respiratory diseases, and Dr. Fauchi has related it to T-cell immunity, though he does not speak in these directions often.
Michigan death rates to September 2020 The disease seems to be over, though only about 20% of the state shows antibodies.
T-cells can cause someone to be immune to a few viral hits, but not immune to higher doses. Assuming that’s what’s going on in MI and MA, and NJ, I’m inclined to suggest we can open up these states a bit, according to the Swedish model. That is make careful efforts to clean public transport, and encourage hand washing and surface cleaning. That we prohibit large gatherings, and we take care isolate those over 65 and protect old age homes. In the US, virtually all the deaths were of people over 65, and about half were people over 85, with men being particularly vulnerable. A heterogeneous opening of this sort has been recommended by scientists as early as March.
There are three major problems with lockdowns that keep us from all virus particles. These lockdowns kill the economy, they leave us with lousy education, and they likely leave us as at-risk for the disease later on, when the lockdown is lifted. Instead a heterogeneous opening leaves the economy running and exposes us to some small exposure, at a level that our typical level of T-cell immunity may be able to handle. Over time we expect our T-cell immunity will rise and we’ll be able to take off our masks entirely. It’s a nice route to a cure that does not require a vaccine.
The above approach requires us to trust that people will do the right thing, and requires us to accept that each may do it in his/her own way. Some may not wear the mask all the time, but may chose exercising, or staying in the sun and taking vitamin D. Some may keep to masks, or focus on hand washing. Some may try unapproved drugs, like hydroxychloroquine. We will have to be able to accept that, and our experts will have to be able to step back from running everything. In China and Russia, the experts tried run every aspect of farm production, using only science methods. The result was famine. A similar thing happened in Ireland and got a potato famine. It’s good to have expert advice, but as far as making the actual decision in each location, I put a lot of weight on the choices of those who will bear the consequences.
Robert Buxbaum September 30, 2020. As a summary, I’m for opening schools, opening most states, with masks, and hand-sanitizer, at lower occupancy ( ~50%), limiting large gatherings, going to zoom as much as possible, and isolating the aged particularly the old age homes. I also recommend vitamin D and iodine hand sanitizer.
There are small errors and great mistakes. I’d previously written about the mistakes that caused Britain to lose America — e.g. General Tarleton burning churches because he thought the sermons were anti monarchist. They were, but if he thought they were anti monarchist before burning the church, they were far more so after… He’d misjudged the American character, something that I think the Democrats are doing today with BLM. Another example was the British attack on Bunker Hill. They spent the lives of 600 soldiers, won a hill they didn’t need, and lost the colony. It’s a mistake we would make reputedly in Vietnam.
Another one of the larger of mistakes of history – and one that changed hsotry massively was made by Mohammad II, ruler of Persia and eastern Islam, from Turkey to Kazakhstan, Uzbekistan, and Afghanistan. He had an army of 100,000 and ruled from the walled city of Samarkand. Mohammed’s uncle, Inalchuq, served as a governor in Kazakhstan. With an army of 40-50,000, he ruled from the walled city of Otrar. A Mongol leader named Temujin contacted them asking to trade. Mohammed II ignored the request, but his uncle accepted it. Temujin ruled a poor, distant community of perhaps 100,000, and boasted a motley horse army of perhaps 10,000. But, what Mohammad II didn’t appreciate, was that these Mongol horsemen were uncommonly warlike, and that Temujin, also known as Genghis Kahn, was an uncommonly talented leader.
Gate of the mighty, walled city of Otrar. It’s now a ghost town.
Temujin was not someone to insult. He had laid waste to northern China, and defeated an army of over 1 million, because of an insult. The Chinese emperor had demanded Temujin come to Peking with a grift, then bow low and pledge allegiance. That is he wanted Temujin ,to Kowtow, a request that emperors had made to every tribal leader for centuries, but Temujin took it as an insult. He defeated the Chinese army and killed a good fraction of China’s population. Using methods that are discussed in Mongol literature, but are almost unknown in the west, or highly perverted, as in Mulan. I’ve written in speculation of one aspect of Mongol success here. Another aspect was psychological: Genghis Kahn was able to co-opt the Chinese army, and get them to fight for him. It’s a useful skill.
Now Temujin, Genghis Kahn, was writing to the leaders of eastern Islam asking to trade along the silk road. Inalchuq offered safe passage, and in 1218, the first trade caravan arrived with 100 laden camels and 450 men including an ambassador. Inalchuq did what sultans before him had done: He executed most of the men, sold the rest as slaves, and took the goods, selling them in markets of Bukhara. Mohammed II and his uncle were sure that Temujin would do nothing, he was 2000 miles away, but Temujin sent another peace delegation. This time 3 men direct to Mohmmed II asking for his goods back and for the punishment of those responsible. Mohammad II killed the lead ambassador, blinded one of the others, and had the face of the third disfigured. A year later, 1219, Genghis Kahn showed up in Otrar with siege engines.
Otrar held out for 5 months, falling when a traitor opened the gates and defected with part of the army. The Mongols took the city and let most people live, though he killed Inalchq and his army, as well as the defectors.. Genghis Kahn figured he could not trust a soldier who defects this way. Inalchq was killed by having molten silver poured into his eyes and ears.
Death of Sultan Mohammed II, Picture from the History of Rashad Al-Din.
Genghis then went after Mohammed II, but first defeated the Assassin sect. Mohammed had the sense to run. It didn’t save him, but it did buy him some years of life. When caught, Genghis locked him in a prison fed him gold coins. He is supposed to have explained that, had Mohammad II not hoarded gold, but shared it with his soldiers, they would have fought for him as Genghis’s soldiers had. It’s not a message we like to hear today because it’s practical, but not very charitable. Then again, Genghis Kahn was nothing if not practical.
The Mongols brought many innovations: paper, stirrups, the blast furnace, the number zero, “islamic numerals” (they’re really Mongol /Tibetan numerals), the compass, the printing press, the triangular plow, gun powder, and a new way in war (The Germans called it ‘Blitz Kreig’). I find that schools don’t teach much about Genghis Kahn or our debt to the Mongols, nor do they properly contextualize these innovations as means for a small nation to dominate many larger ones. Perhaps that’s because we find the whole idea of management disturbing, or it’s embarrassing. Western scholars used to write like we invented these things. There are several histories of the Mongols, one was written by Rashid Al-Din (Aladin), vizier over all Persia, the person responsible for renaming it Iran. He wrote an illustrated history of the world, particularly of the Mongols, called Jāmiʿ al-Tawārīkh (“Compendium of Chronicles”). I suspect it would be worthwhile reading but like much of Mongol literature, it is not available in any local library, nor is it referred to by most histories. Another Mongol history, also not available in libraries, is called the Secret History of the Mongols. This was likely written for and by Genghis’s third son, Ogedei, to describe for his children and grandchildren the true story of the early years, the conquests, his father’s and his management methods (some fairly brutal) and as a review of what Ogedei thought worked and what did not. It sounds like an honest book, worthwhile book — the sort modern readers would rather forget exists.
Rashid Al-Din (Aladin), Vizier of Persia. He renamed Persia Iran, and wrote a history of the world from the Mongol perspective. Known as a fictional character, or not at all today.
In general, I find our scholars would like to ignore the more unpleasant lessons of history, including that family matters, and that people like honor over kowtowing, and that they get surly if they’re not rewarded,. Much of our society is built by warriors for the purpose of destruction, as in this engineering joke. We are now in the process of destroying statues of warriors because we find they were often non-nice people who often did not-nice things, or held not-nice views. That’s the way it is with warriors, especially the successful ones. While I’m not a fan of having statues to bums, I think that ignoring successful warriors is worse than honoring them. I discuss the dilemma of military statues here. Without statues to important wars and warriors, modern leaders might repeat the mistake of Mohammed II, or Bunker hill , or of Mohammed IV, or of the Chinese emperor.
Robert Buxbaum, September 20, 2020. I’ve come to wonder if Mohammed II would have fared better if he didn’t steal from the Mongols. He would likely have put off the attack as he learned more about them, and they learned more about him. When the war came, as likely it would, he might have had gun powder, paper, the compass, and the stirrup. Then again, war might have come immediately. The proud Polish officers who collaborated/ surrendered to the Soviet Russians, were quickly murdered in the Katyn forest.
I got the graph below from a global warming blog called “factcheck.” The blue line on the graph below shows Greenland temperatures, constructed by Vinther et al. (2009) using data from six ice cores smooth to 20 year steps. The black line at the right are observed temperatures from Berkeley Earth, with a 20-year smooth applied. To make the graph, the observed temperatures, and ice temperatures were aligned over the 1880-1960 period. According to many this shows a disaster that we caused, and that we must reverse by stopping US industry. I’m not so sure.
It is seen that theGreeland temperature has risen 1.5°C over the last century, or 4°C since 1710. The first issue is that the rise since 1710 to 1810 is rather substantial, about 1.3°C and the level of world industrialization was a lot less, but more importantly, when I look at this curve, the part that worries me is not the spike at the right, but the bit at the left. I’m far more comfortable with another degree or three of Greenland heating, than I am with an ice age and the 50°C drop that entails.
As for stopping US industry to cure the rise, that too seems like a bad idea since most of the carbon dioxide comes not from us, but from China, with quite a bit from India. If we stop our poroduction, we merely hurt ourselves while moving production, and CO2 to China. I suspect that those behind this are Chinaphiles — Sinophiles.
We’re still in the midst of a frenzy of statue removals, and among the most popular to remove is Columbus. The City of Columbus Ohio just removed theirs, and Detroit soon followed. What Columbus is accused of is colonialism, bringing evil western values and western religion to the peaceful Indians. At least that’s the legend being told these days.
The war god, Huitzilopochti, son of the sun, seated at right, required thousands of human sacrifices to keep the sun from going out. Columbus claims that many Indians preferred Christianity to his worship.
According to Columbus and his followers, the Indians of 1492 included some who were peaceful, and others who were murderous cannibals. According to Columbus, the less-violent of the Indians willingly accepted Christianity, or a sort, considering it better than the human sacrifice they were used to.
Mask for Tezcatlipoca, god of the night and sorcery, secondary son of the sun, brother of Huitzilopochtli.
Columbus described people being roasted and eaten with pineapple. Some of Columbus’s crew who were captured, claim they, were fattened for eating, and that others were eaten. That also is the story of Captain Cook, who appears to have been cooked and eaten in 1791, and of Michael Rockefeller, eaten by cannibals in New Guinea in 1961. Some customs die hard.
The natives of Mexico of the time are known to have practiced slavery and human sacrifice, killing thousands of young men and women each year to a wide variety of gods. For Huitzilopochtli, the war-god, son of the sun, Mexican priests cut out the still -beating hearts of adult male slaves, and ate them. This was done to prevent the sun from going out. On flat rocks they same Mexican Indians sacrificed to his brother, Tezcatlipoca, the god of the night and of sorcery. Though Texcatlipoca was slightly less powerful, he was more personally useful. The sacrifice to Tezcatlipoca is reminiscent of the attempted sacrifice of John Smith of the Virginia colony. According to testimony, in 1607, Smith was captured while hunting, kept in captivity for a few days, and was going to be sacrificed on a flat rock until saved by Pocahontas, the chief’s daughter. Later Pocahontas converted to Christianity, travelled to England, and was presented to King James I.
Pocahontas, renamed Rebecca, in 1616.
Related to the story of John Smith of the Virginia colony, is the landing of John Smith of the Massachussetts colony. The reason they settled on that spot in Plymouth bay, was that, when they landed there in 1620, the land was already cleared, but empty. Apparently, there had been a farming Indian tribe who had cleared the land, but had been recently killed off or enslaved by the local Iroquois. The Iroquois practiced slavery against their fellow Indians well before the arrival of the first African slaves in 1619. According to Frederic Douglas in 1870, the Indians treated their slaves better than the white settlers did, but he was writing 150 years later. The peaceful Indian, Squanto who helped the Massachusetts colony had been captured and brought to England in 1609 and brought back to the Americas by the John Smith of the Virginia colony. Squanto lived as a free man among the pilgrims. Squanto helped negotiate a peace treaty for the colony with the Wampanoags against the Narragansett. This treaty was settled at the first Thanksgiving, and lasted for the life of the Wampanoags Chief.
Returning to the Gods of the Mexicans, Tlaloc, the rain god, was responsible for fertility and agriculture. He required the sacrifice of children. There was also a corn god, Centeotl, I think Steven King has a story about his worship, it involved a corn sacrifice, plus spilling your own blood and killing a young woman and using her skin as a mask. There was also the feathered serpent god, Quetzalcoatl, god of love, knowledge, and intoxicating drink. She required the sacrifice of a mix of men, women, and children, plus ingestion of intoxicating substances. Columbus claimed that many Indians willingly changed religion to Christianity and away from the worship of these deities, a claim that modern liberals find ludicrous, but that I find believable. I think modern liberals imagine themselves as the priests of these religions, or perhaps nobles, but they do not see it, as I do, from the perspective of the unwilling sacrifices.
The folks behind the removal of Columbus statues and behind defunding the police would like to use the money for education about the noble pre-Columbian peoples. They would like to focus on the pyramids and on the large, flat sacrificial stones, without spending too much time on what the pyramids and stones were used for.
Chief Tammany signed a peace treaty with William Pitt in 1683. His grandson converted to Moravian (Protestant?) Christianity. He is considered a model of good will and good government.
The fate of the Indians varied. Some converted to Christianity, some did not. Some tribes integrated well into the new society, many did not. Among the most famous who converted and integrated well, we find Chief Tammany of the Turtle clan of the Delaware Indians. He signed a peace treaty with William Penn, 1683, and his tribe seems to have lived in peace with the settlers for 70 years at least and married into the most prominent families of the area. The Turkey of the same tribe did not fare so well, They sided with the French and warred against the English settlers, and suffered with the French defeat. Western involvement was not always good or fair to the Indians, but that is not inherently Columbus’s fault. Columbus did a service, I think, opening up the new world, and providing an alternative religion to natives who were rescued from human sacrifice. I believe western civilization is a boon to the world by the very balance of order and freedom that some find troubling. The Jewish Bible is strongly against tightly ordered religions with human sacrifice. Christianity is a big improvement, IMHO.
There are two main routes for catching flu. One is via your hands and your eyes and nose. Your hands pick up germs from the surfaces you touch, and when you touch your eyes or nose passages, the germs infect you. This was thought to be the main route for infection, and I still think it is. I’d been pushing iodine hand sanitizer for some time, the stuff used in hospitals, saying that that the alcohol hand sanitizer doesn’t work well, that it evaporates.
The other route, the one touted by the press these days is via direct cough droplets, breathing them in or getting them in your eyes. Masks and face shields are the preferred protection from this route, and the claim is that masks will stop 63% of the spread. The 63% number has an interesting history, it comes from this test with infected hamsters. Hamsters are 63% less likely to infect other hamsters when they wear a mask. Of course, the comparison has some weaknesses: hamsters don’t put their fingers in their noses, nor do they rub their eyes with their hands, and hamsters can be forced to keep the mask barrier all the time — read the study to see how.
A more realistic study, or more relevant to people, in my opinion showed a far lower effect for masks, about 20%. During the HiNi flu pandemic of 2009 a group of 1437 college students at a single university were divided into three randomized groups, see the original report here. Students at a few chosen residence halls were instructed to wash their hands regularly, use sanitizer, and wear masks. Students at other halls were either told to wear masks only, or told to go on as they pleased. This was the largest group, the control. They included students of the the largest residence hall on campus. The main results appear as the graph below, Figure 1 of the report. It shows a difference of 6% or 20%, depending on how you look at things, with the mask plus hand-health group, MPHH, doing the best.
After 6 weeks of monitoring, approximately 36% of the control group had gotten the flu or some collection of flu symptoms. The remaining 64% of the residents remained symptom free. This is he darkest line above.
Of the FM Only group, the medium line above, those instructed to wear face masks only. 30% of this group showed flu symptoms, with 70% remaining symptom free. Clearly masks do help with humans, but far less than what you’d expect from the news reports.
Sweden kept the primary schools open and allows people to wear masks and social distance at they see fit. The death toll to August 1 is identical to Michigan, or slightly bette Sweden’s top virologist recommends that the US follow suit. Open up and trust people.
The group that did best was FMHH, the group who both wore facemarks and used hand health, regular hand washing plus hand sanitizer. This group reported an average of 3.5 hours per day of mask use above the control group average. This is about as good or better than I see in Michigan. Adding the hand health provided an additional 1% improvement, or a 3% improvement, depending on how you look at these things. The press claims hand health is wasted effort, but I’m not so sure. I argue that the effect was significant, and that the hand sanitizer was bad. I argue that iodine hand wash would have done better at far less social cost.
I also note that doing nothing was not that much worse than mask use. This matches with the observation of COVID-19 in Sweden. With no enforced social distancing, Sweden did about the same as Michigan — slightly better, despite Michigan closing the schools and restaurants, and imposing some of the toughest requirements for social distancing and mask use.
Other things that affect how likely you are to get flu symptoms. I find these rustles more interesting than the main face-mask result.
There were other observations from the university study that i found isignificant. There are racial differences and social differences. The authors didn’t highlight these, but they are at least as large as the effect of mask use. Asians got the flu only 70% as often as others, while black students got it 8% more often. This matches what has been seen in the US with COVID-19. Also interesting, those with a recent flu shot got flu more often; those with physical activity 13% more often. Smokers got the flu less than non-smokers and women got it 22% more often than men. The last two are the reverse with COVID-19. I could speculate on the reasons, but clearly there is a lot going on.
Why did Asians do better than others? Perhaps Asians have had prior exposure to some similar virus, and are thus slightly immune, or perhaps they used the masks more, being more socially acceptable. Why were smokers protected? It’s likely that smoke kills germs; was that the cause. These are speculations, and as for the rest I don’t know.
I am not that bothered that the students probably didn’t wear their masks 100% of the time. Better would be better, but even with mask use 100% of the time, there are other known routes that are almost impossible to remove: clothing, food, touching your face. I still think there is a big advantage to iodine hand wash, and I suspect we would be better off opening up a bit too.
