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"uv from sunlight is, however, lower intensity"

Mate... Try living in Australia. We're sterile af down here.

Yes, but if you stand inside a hospital air handling unit with UVC sterilization lamps with exposed skin you'll have severe burns in a few minutes.

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Women have been taking them for more like 70 years. Since the early 1960's in the U.S. And many take them far longer than 15 years. Start in one's teens and may take them into one's 50's.

I agree we know it does not stop menopause. Or everyone I know would still be taking the pill.

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Drying clothes and airing out mattresses or futons or what have you outdoors makes a lot more sense than it already does

That's a great explanation of the absorption but I think the other missing piece of the puzzle is why the photons that aren't absorbed must be scattered or reflected instead of passing straight through (after all, atoms and molecules are mostly empty space). We know visible light can pass through some solid matter and radio and microwaves can pass through apples.

I don't relish pointing that out because I know the answer isn't easy: I think an answer to that might be need to get into the realms of QED and particle interractions. Nevertheless, I do think any answer to why an orange is orange (not all apples are red so not a great example imo) needs to explain why orange is scattered or reflected and not just why non-orange light is absorbed.

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The reason that brown dwarfs are found in binary systems is probably because they are too faint to see on their own. It was only fairly recently that we could rule out Nemesis, which was a hypothetical brown dwarf star orbiting around Sol.

Okay, sure, but we generate a heck of a lot more radiation that isn’t actually harmful. You won’t get burned by a wireless router.

Even if you completely covered every other part of the body, if you look at the sky, about 20% of the thermal radiation from your eyeballs escapes into space.

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For the sake of anything

U.V from the sun is inherently filtered out to a very large degree by the atmosphere, you cant get around that on the ground.

U.V we generate with whatever technology is only subjected to what we decide it to be.

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Sure, but if you were to be exposed to human made radiation, your burns would be a lot worse.

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> Human made radiation is much more intense than [the radiation from] the sun

I assume you mean for the sake of using it as disinfectant. I was in San Juan this week and I’m reasonably sure my sun burns are not from human-sourced radiation.

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It’s something that’s known and studied in the earth sciences, particularly environmental microbiology. For example on a sandy beach that has been contaminated by raw sewage the sand that has been exposed to sunlight the longest will have a faecal bacteria count lower than that which has been exposed the shortest period of time. A properly collected and processed set of samples can therefore be used to support a prosecution.

As an aside most bacterial contamination on cleaner beaches comes from dogs, so yeah, clear up after your pooches please people.

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