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Cake day: July 18th, 2020

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  • Modern studies using freezers with well-understood properties have observed the Mpemba effect where water supercools before freezing. Water that starts out cooler tends to reach a lower supercooled temperature before freezing.

    Also from the Wikipedia article.

    If you define the Mpemba effect as hot water reaching 0 degrees faster, then no, it’s not observable. But if you define the Mpemba effect as heated water freezing sooner, (remembering that freezing can initiate below the “freezing point” when water is subcooled) then the Mpemba effect may be observed.

    If true, it would be interesting that cool water is less likely to nucleate and form ice than water that was heated.



  • Xavienth@lemmygrad.mltoScience Memes@mander.xyzFictional
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    1 month ago

    Right but the actual quantities are arbitrary. A metre is a fixed fraction of the speed of light in a vacuum, but it’s an arbitrary fraction chosen because it was convenient. We could just as well have chosen it to be half or twice as long. Same with the second. And the kilogram, etc.













  • It used to be when you searched for something, it was information first, products second. If you searched bicycle, it would give you the Wikipedia page for bicycle, and then pages related to bicycles, some of which would be retailers. Now it’s the other way around, if the informational pages even show up at all.

    Forget all the AI bullshit, this is my biggest gripe with search engines today. This is why people use ChatGPT - for all its faults - to search shit that Google used to answer. ChatGPT will confidently lie to you, but it least it gives you an answer instead of trying to sell something to you.


  • Surely it a river doesn’t go all the way around the earth. Rivers typically have one (or many) start points, where they are surrounded on three sides by land, meaning it’s possible to cross from one side to the other. Otherwise it’s just a strait or channel.

    However, that assumes you are not on the land in between a fork in the river. In which case you would have to cross a bridge outside of Königsberg, and we might have to expand the problem to crossing every bridge on the continent once.