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Cake day: August 3rd, 2023

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  • sushibowl@feddit.nltoScience Memes@mander.xyzLaunches
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    6 days ago

    So, yeah, bottom line: you only need a delta-V of about 12 km/s to get out of the solar system, but a delta-V of 30 km/s to get to the sun without going into orbit.

    This is true, but the possibility of gravity assists mostly nullifies the difference. If you can get out to Jupiter you can basically choose: either let it sling you out of the system, or let it cancel out all your orbital velocity so you fall into the sun.


  • sushibowl@feddit.nltoScience Memes@mander.xyzLaunches
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    6 days ago

    These are all technically correct but fairly inconsequential. Even just to graze the sun you need to lose 90% of your orbital velocity. And although everything orbiting the sun will eventually fall in, the friction is really low. It will take billions of years to lose enough velocity to fall in.





  • sushibowl@feddit.nltoScience Memes@mander.xyzTough Trolly Choices
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    3 months ago

    It seems to me that, since the set of real numbers has a total ordering, I could fairly trivially construct some choice function like “the element closest to 0” that will work no matter how many elements you remove, without needing any fancy axioms.

    I don’t know what to do if the set is unordered though.



  • Semmelweis discovered that a particular type of infection was much less likely to occur when doctors washed their hands with chlorinated lime water between doing an autopsy and examining a patient. However he did not know why or how this worked, and did not discover microorganisms (which were already observed by Antoni Van Leeuwenhoek some ~180 years earlier).


  • sushibowl@feddit.nltoScience Memes@mander.xyzMushroom ID
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    4 months ago

    Looks like a destroying angel (e.g. Amanita virosa) to me. This and the death cap together account for the vast majority of mushroom poisonings in the world. Cooking it will not destroy the toxins, nor will acid. Symptoms tend to appear 5-24 hours after eating, too late to pump the stomach. Half a mushroom can be enough to kill you.

    I don’t recommend going out to pick mushrooms unless you know what you’re doing. If you do, stay away from the white ones. You can still get terrible stomach cramps and diarrhea from other colors of mushrooms, but the white ones have the most dangerous species.


  • The numbers are different because the site doesn’t naively count every line but merges some as a single package. For example, at the very top of the Debian list we have 0ad, 0ad-data, 0ad-data-common. These are all counted as one single “package.”

    One might argue that doing the comparison in that way is more useful to an average user asking “which distribution has more software available.”