We know that mirages occur in the desert or on highway and many of us have seen them ourselves. But I had never seen the effect reported in this article where a ship seems to float above the sea.
Mano Singham
Just another Freethought Blogs site
We know that mirages occur in the desert or on highway and many of us have seen them ourselves. But I had never seen the effect reported in this article where a ship seems to float above the sea.
I know almost nothing about cryptocurrencies or the blockchain technology that undergirds it. I was aware that all transactions by currency holders are recorded on a distributed public ledger, which apparently is what is meant by a ‘blockchain’. I had been aware that these currencies, of which there are many in addition to the best known one of bitcoin, are not backed by any government like ‘real’ currencies are. Their value is maintained by having their production limited by having it ‘mined’, which is a metaphor for actions that are done by computers.
Elizabeth Kolbert writes about how this ‘mining’ works.
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I have been seeing a lot of stories such as this one about how staying at home and social isolation has resulted in some people changing their personal hygiene habits, sometimes entirely jettisoning some of them.
Working from home, shielding, not socialising or just losing the will to blow-dry appear to have had many of us questioning whether our pre-pandemic personal hygiene and grooming habits were really necessary. And, with routines disrupted, it is perfectly possible to get to the end of the day before wondering if you have brushed your teeth. Or putting off your morning shower until you have done some lunchtime exercise, and then not bothering to do that either.
Vaccination rates in the US are slowing down as the people who want to take it have increasingly done so, leaving mostly the so-called vaccine-hesitant and the vaccine deniers. The US is reaching a point where there are excess stocks of unused vaccines.
The United States could have around 300 million excess Covid-19 shots by the end of July, health policy experts at Duke University estimated in a report Thursday, calling on the country to share doses more widely to address the stark inequality around global vaccine distribution.
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People tend to like certainty. One of the things that people get wrong about science is that they think it should provide them with that certainty. But scientific conclusions, while they tend to be the most reliable that we have at any given time, can change in the light of new evidence which is why results are usually phrased conditionally. Unfortunately that nuance is often missing when the media reports science results and this can be disconcerting for some people when new results seem to contradict the old. I deal with this question quite extensively in my book The Great Paradox of Science.
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Projecting the surface of a globe on to a flat surface always introduces distortions. Richard Gott, Dave Goldberg, and Bob Vanderbei claim to have created created a projection that minimizes the errors more than any projection before.
Previously, Goldberg and I identified six critical error types a flat map can have: local shapes, areas, distances, flexion (bending), skewness (lopsidedness) and boundary cuts. These are illustrated by the famous Mercator projection, the base template for Google maps. It has perfect local shapes but is bad at depicting areas. Greenland appears as large as South America even though it covers only one seventh the area on the globe.
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The headline that 2.5 billon T. Rex dinosaurs walked the Earth was definitely something that caught my attention. It turns out that that number was just the average with a massive variation in possible values. What I was more interested in was how one sets about even making an estimate of the number of animals in a species that has been extinct for 65 million years. The paper lays out the problem and basic method they used.
Although much can be deduced from fossils alone, estimating abundance and preservation rates of extinct species requires data from living species. Here, we use the relationship between population density and body mass among living species combined with our substantial knowledge of Tyrannosaurus rex to calculate population variables and preservation rates for postjuvenile T. rex. We estimate that its abundance at any one time was ~20,000 individuals, that it persisted for ~127,000 generations, and that the total number of T. rex that ever lived was ~2.5 billion individuals, with a fossil recovery rate of 1 per ~80 million individuals or 1 per 16,000 individuals where its fossils are most abundant. The uncertainties in these values span more than two orders of magnitude, largely because of the variance in the density–body mass relationship rather than variance in the paleobiological input variables.
True freedom loving Merkins who see wearing masks during a pandemic as a horrendous violation of their rights should patronize this place where all the precious freedoms of everyone are respected.
The US is temporarily halting giving this vaccine, pending further study, because of the potential danger of blood clots. Six women developed a rare form of blood clots after receiving this vaccine and one died.
The acting FDA chief, Janet Woodcock, said: “We’re recommending this pause while we work together to full understand these events.” The decision was taken in coordination with the CDC.
US health agencies have recommended states pause the administration of the Johnson & Johnson coronavirus vaccine, after reports of rare and severe blood clots emerged in six women. More than 6.8m doses have been administered nationally.
The concerns mirror those of drugs agencies in Europe and Australia over the AstraZeneca vaccine, which has not been authorized in the US. There have been no significant safety concerns raised about the two other vaccines that make up the majority of US supply, from Pfizer-BioNTech and Moderna.
Woodcock said: “Right now, I’d like to stress these events appear to be extremely rare. However, Covid-19 vaccine safety is a top priority for the federal government. We take all reports of adverse events related to the vaccine very seriously.”
The FDA and CDC said in a joint statement: “People who have received the J&J vaccine who develop severe headache, abdominal pain, leg pain, or shortness of breath within three weeks after vaccination should contact their healthcare provider.”
Yesterday April 12th 1961 was the 60th anniversary of when Yuri Gagarin became the first person to orbit the Earth.
Over the course of 108 minutes, Vostok 1 traveled around the Earth once, reaching a maximum height of 203 miles (327 kilometers). The spacecraft carried 10 days’ worth of provisions in case the engines failed and Gagarin was required to wait for the orbit to naturally decay. But the supplies were unnecessary. Gagarin re-entered Earth’s atmosphere, managing to maintain consciousness as he experienced forces up to eight times the pull of gravity during his descent.
Vostok 1 had no engines to slow its re-entry and no way to land safely. About 4 miles (7 km) up, Gagarin ejected from the spacecraft and parachuted to Earth. In order for the mission to be counted as an official spaceflight, the Fédération Aéronautique Internationale (FAI), the governing body for aerospace records, had determined that the pilot must land with the spacecraft. Soviet leaders indicated that Gagarin had touched down with the Vostok 1, and they did not reveal that he had ejected until 1971.