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Cake day: July 1st, 2023

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  • bluemellophone@lemmy.worldtoScience Memes@mander.xyz8 Minutes
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    1 month ago

    It takes 8 minutes for the light to travel from the sun to Earth. Because light in a vacuum travels faster than anything, including information, we would not and could not know it had disappeared for 8 minutes. This means Earth would continue to follow its orbit around a non-existent sun for 8 minutes because the Sun’s gravity would still be acting on the Earth.

    If it was nighttime, you wouldn’t notice the sudden lack of sunlight (other than if it was a full moon) but you’d almost certainly notice the change in gravity.

    Edit: actually, you wouldn’t feel any difference in gravity or experience any change of acceleration. What you would experience is a very tiny vibration, of 1 million push notifications being sent to your phone from the other side of the planet.




  • Reinforcement learning is a machine learning (ML) technique (“AI” in layman terms) for optimizing neural networks and other types of non-linear models.

    As far as ML math goes, this is fairly tame. It looks complicated, but is spelled out clearly in the paper. A lot of these kind of theoretical papers — things that would get published in Automatica — are going to lean very heavy on math.

    Source: PhD in Computer Science with dissertation using neural networks.







  • bluemellophone@lemmy.worldtoAsklemmy@lemmy.mlWhy are many men growing beards again ?
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    4 months ago

    Long story short: WW2

    The military required men to be clean shaven, which was partly tactical (proper gas mask seals), partly to whitewash the service (e.g., black men can have severe skin reactions to shaving every day), and had other benefits to unit cohesion and general order (routine personal fitness and hygiene).

    Well, that stuck, and an entire (massive) generation of men and their male children were taught that to be good they simply had to be clean shaven. Those two generations make up the vast majority of business and political power in the US, so the idea of “success” and “power” was idolized by a clean shaven male. This was further accentuated by the counter culture reaction of this cohort’s kids in the 60s and 70s, where longer and unkempt “bad” hair was cast against this “good” clean shaven look.

    Fast forward to today, those traditions and appearances have been baked into most of modern life. As the boomer population starts to fade away, so will the tyranny of the razor.