fsh

64 ms·

871.
by fsh 6y ago
Getting Uranium is not particularly hard anyway. The difficult bit is enriching it to weapons grade.
872.
by fsh 6y ago
The ELT is built by the ESO (European Southern Observatory), not ESA.
873.
by fsh 7y ago
Having an analytical formula is nice, but in practice this has been solved numerically for many decades.
874.
by fsh 7y ago
Sub-µm accuracy is not at all easy for a CNC mill and the surface quality is way to bad for optics. Commercial aspheres are polished with special CNC grinders, but achieve nowhere near the quality of spherical lenses. Only recently magnetor
875.
by fsh 7y ago
Unlike the other people in the list, Musk (and Huges) have never made a significant scientific discovery or invention.
876.
by fsh 7y ago
The proposed solution is not about modelling though. It is an advertisement for a completely unproven analytical technique.
877.
by fsh 7y ago
Grandiose statements with zero technical details make this sound a lot like "Theranos for Viruses".
878.
by fsh 7y ago
WHO never claimed this, they (correctly) cited what Chinese authorities were saying. Here is the full text of the tweet for people that don't like reading images of text: > Preliminary investigations conducted by the Chinese authori
879.
by fsh 7y ago
As did several countries. From the article it should be clear that the observers were there to learn from their Chinese colleagues, not to conduct independent research on human-to-human transmission.
880.
by fsh 7y ago
Taiwan didn't even have a confirmed case until January 21. They couldn't possibly have reported anything but unconfirmed rumors from China. WHO warned about human-to-human transmission as soon as it was confirmed by Chinese scient
881.
by fsh 7y ago
It's worth keeping in mind that they are running benchmarks on a massive dual-socket 48 core machine where slight tweaks of the scheduler can have a big effect. I would be very surprised to see such big differences on a normal desktop
882.
by fsh 7y ago
Martinis has always been quite honest about what their technology can and cannot do. Probably too honest for the Google managers.
883.
by fsh 7y ago
The overall mortality rate in NYC is more than double the usual [1]. I guess that most people above a certain age have at least one comorbidity such as diabetes or high blood pressure. [1] https://www.nytimes.com/interactive
884.
by fsh 7y ago
You can wash or disinfect your hands because the top layer of the skin is not living tissue.
885.
by fsh 7y ago
The viruses are replicating inside your cells. You can't just "disinfect" living tissue without killing it. There is a reason why medicine relies on evidence and does not recommend whatever random "treatment" someon
886.
by fsh 7y ago
Now you are confusing a number of different things. Einstein used a free-falling sealed box to derive the equivalence principle. This does not imply that any free-falling system is a sealed box. Thinking about clocks makes absolutely no sen
887.
by fsh 7y ago
Yes, you seem to have a fundamental misunderstanding about what free fall means. In the absence of other forces, a body in a gravitational field experiences a constant acceleration that only depends on the strength of the field. In the a
888.
by fsh 7y ago
For example by comparing two extremely good clocks. Or the same way the earth's gravitational potential is mapped - by measuring the relative height and the gravitational acceleration in many points and numerically integrating along th
889.
by fsh 7y ago
Of course there is. The gravitational potential does not depend at all on the (non-relativistic) velocity.
890.
by fsh 7y ago
Yes, one can measure the difference in gravitational potential between two locations by comparing clocks. This is precisely what was done in the Skytree experiment.
891.
by fsh 7y ago
The clocks were of course compared in previous experiments with no height difference between them. The Skytree experiment is directly measuring gravitational time dilation which is a central prediction of General Relativity. Combined with a
892.
by fsh 7y ago
Basically all fiber data transmission is done in the near-IR between 800 and 1600 nm.
893.
by fsh 7y ago
There are some red flags about this study though. German press is reporting that a PR firm founded by the notorious yellow-paper journalist Kai Diekmann is involved in publicizing the results. Diekmann was recently involved in a scandal whe
894.
by fsh 7y ago
Indeed PCR tests only test for the presence of the virus itself. Their big advantage is an extremely high specificity. Antibody tests are plagued by large numbers of false positives.
895.
by fsh 7y ago
I don't see how this theory would be compatible with the rapid rise in hospitalizations and deaths that was observed in the last weeks. If many people had been infected a long time ago, why are they only now starting to get sick?
896.
by fsh 7y ago
Austria has just published the results of their first representative study on about 1500 randomly selected people [1]. They found 0.33% infection rate (confidence interval 0.12% to 0.76%). While this figure is somewhat larger than the previ
897.
by fsh 7y ago
Flight attendants indeed have a significantly increased cancer risk which is most likely due to radiation exposure: https://ehjournal.biomedcentral.com/articles/10.1186/s12940-...
898.
by fsh 7y ago
Possible health effects of non-ionizing radiation have been studied in all kinds of frequency bands for many decades. So far, no significant effects that go beyond heating have been found, and there is no known mechanism that could cause su
899.
by fsh 7y ago
Jitsi simply forwards the video streams between users, whereas some proprietary services seem to re-encode everything into a single stream. So in a large conference each client might have to deal with decoding dozens of high-resolution stre
900.
by fsh 7y ago
I find it quite surprising that government agencies around the world are even considering using a US/Chinese-hosted video-conferencing system. Both countries have a long history of spying on pretty much all foreign nations wherever pos

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