• 2 Posts
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Joined 10 months ago
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Cake day: December 5th, 2023

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  • tl;dr:

    The research was initiated after scientists on the research team reported seeing occasional flashes of green light while working with an infrared laser. Unlike the laser pointers used in lecture halls or as toys, the powerful infrared laser the scientists worked with emits light waves thought to be invisible to the human eye.

    But packing a lot of photons in a short pulse of the rapidly pulsing laser light makes it possible for two photons to be absorbed at one time by a single photopigment, and the combined energy of the two light particles is enough to activate the pigment and allow the eye to see what normally is invisible.

    “The visible spectrum includes waves of light that are 400-720 nanometers long,” explained Kefalov, an associate professor of ophthalmology and visual sciences. “But if a pigment molecule in the retina is hit in rapid succession by a pair of photons that are 1,000 nanometers long, those light particles will deliver the same amount of energy as a single hit from a 500-nanometer photon, which is well within the visible spectrum. That’s how we are able to see it.”

    Neat! But please don’t shine lasers into your eyes even if it’s supposed to be invisible.






  • Evolution doesn’t select for positive traits, just not-negative. If a trait doesn’t strongly reduce the chance of reproducing, it can get passed down.

    For example, humans have plenty of neutral traits (hair color, eye color), and even plenty of negative ones (Alzheimer’s, arthritis, baldness, cancer, sickle-cell disease). But they’re not so fatal that they don’t get passed down.

    Similarly, if neutral traits like cannabis including whatever chemical causes the munchies doesn’t reduce that plant’s ability to reproduce, it’ll get passed down.





  • Seems like a bit of a reach to go from knowing which appliances you use and when, to identity theft and harassment by your landlord.

    Besides, I feel like even if your landlord was able to get this info (in the US, utilities are surprisingly protective of account access), they’d be able to do much more just by virtue of having physical access to the property.

    The burglary or home invasion angles I can see, but it actually working out like that seems extremely unlikely.








  • They absolutely do fund development like this. But they keep it for themselves until such time that it no longer gives them a competitive edge.

    For example, when the US sells tanks or planes to other countries, those export versions have much less fancy equipment on the inside. Or in pure science like cryptography, you can assume that when the NSA publicly approves of an algorithm, they’re confident that they can break it if they really need to (either because they inserted a backdoor, have identified a weakness they can exploit, or just have no use for it any more themselves).