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Cake day: June 18th, 2023

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  • mkwt@lemmy.worldtoAsklemmy@lemmy.ml[deleted]
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    3 days ago

    There was a book a while back called Guns, Germs, and Steel that delves into this topic.

    The root cause, as I understand it, is that Europe is on a continent oriented east-west instead of north-south. And Europe in particular is on the part of that continent that has a lot of easy access to the sea.

    East-west orientation allows you to transplant plants and animals long distances and keep them at roughly the same latitudes, which means roughly the same climate. That is a big boon for spreading “civilized” agriculture, which is what creates surplus of labor, which creates non food jobs that advance technology.

    Among the common 5-7 domesticated food animals people eat today, all but one or two were domesticated in Mesopotamia, but then spread all over Europe.

    Access to the sea is the other component that turns tech advantage into colonialism, because it gives the transportation. Even today, China and Russia are great powers, but they are forced to be continental powers instead of maritime powers, because nearly all of their coast lines are hemmed in by narrow seas that are easy to blockade.

    There are, of course, a bunch of other factors I’m not even thinking about and competing opinions. But I don’t for one second think that any of this has anything to do with European “innate intelligence” or skin color.


  • The Federal gov in the US has a “road legal” standard for commercial motor vehicles like trucks and buses. The feds also have minimum rules for headlights, brake lights and turn signals on passenger cars.

    Everything else in terms of road legality is a state law in each of the 50 states.

    The reason is the Constitution gives the feds power to regulate interstate commerce (i.e. big commercial vehicles that frequently cross state lines). The feds do not have the general “police power” that states have to pass laws on whatever.



  • I gave you the downvote because I once attended a public lecture by Stephen Hawking, near the very end of his lifetime. It had to be one of the few, very last, public lectures that Dr. Hawking had in him. And the topic of that lecture was the nature of time, and how all of the equations of motion are fully reversible, etc, etc etc.

    Out of all of the topics Dr. Hawking could have discussed, that one is the one he chose. And to me, that means that the nature of time was interesting enough to him to spread around to the public. That there are live issues that are not well settled. And so on.

    Since that time, I’ve not seen any major developments in theoretical physics or philosophy to shift the status quo to an appreciable degree.

    This leads me to the final judgement on your comment: You are wrong. There are live issues to discuss here, and OP deserves to further explain, defend, and debate their philosophy.










  • mkwt@lemmy.worldtoMicroblog Memes@lemmy.worldAstigmatism
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    26 days ago

    Oh yeah. The starburst patterns absolutely are an unavoidable artifact of the axis correction in the lens. They are the result of diffraction doing Fourier optics on point light sources through an anisotropic (non-directionally symmetric) lens system.

    As an example, here’s the James Webb Space Telescope, which has a hexagonal starburst pattern because its primary mirror is composed of hexagons (I believe the smaller horizontal spike is from the secondary mirror support strut):


  • The vacuum is only ≈3K, or -270.15° C, but a vacuum is not particularly receptive to heat dispersal.

    This is true for all of the black parts of the sky.

    It is not true for that big yellow ball that shines on the space station half of the time. That big yellow ball is as bright and hot as a hot desert day on the surface. Daylight can raise the vacuum temp up to +250 or +300 C. And it also means that the night time temps don’t cool down all the way to 3K.

    So the ISS is continuously exposed to these thermal cycles on the outside. As a heat load these should dwarf any marginal heat loads introduced by whatever recreational drugs. And the station has to have radiator capacity handle it all plus margin. Remember, too, that the ISS crew also has to do hard exercise 2 hours per day.



  • mkwt@lemmy.worldtoMicroblog Memes@lemmy.worldAstigmatism
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    27 days ago

    To correct any possible astigmatism, it would require an infinite sum of series of correction terms at different angles and strengths.

    But every glasses prescription I’ve ever gotten in the United States cuts that series off at one term. I’ve never seen nor heard of anyone getting custom lenses with two or more axes. It seems like it should be theoretically possible, but I also know very little about the process of lens grinding.


  • If we’re using NASA as a reference Suni Williams and Butch Wilmore were in space for 286 days instead of a planned week long mission.

    They did get resupplied with additional clothing and personal effects after a few weeks.

    Coincidentally, there is no laundry or shower on the international space station.


  • I’m addition to removing the cartoon old man and barrel iconography, Cracker Barrel is reducing the amount of random junk on the walls, and painting the bare wooden walls white. (Select stores only, not everything gets remodeled all at once). Probably they’re trying to appeal more to a younger generation or something.


  • mkwt@lemmy.worldtoMicroblog Memes@lemmy.worldAstigmatism
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    27 days ago

    Eyeglass prescriptions that correct for astigmatism have one “axis” or direction that can be specified. Real astigmatism can be vastly more complex than a single diopter adjustment in one direction. This makes many real astigmatism cases effectively uncorrectable.