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This reminds me of something I've been wondering about for a while now - burning hair has a distinct and very strong smell. That makes sense - if your hair is on fire, you want to know ASAP. My question is whether our hair evolved to have something in it that produces this smell, or if we just evolved to be particularly receptive to the smell of burning keratin.
That is of course ignoring the boring answers: "A little bit of both" and "It just worked out like that randomly", as well as the best answer "Wait, that's what that smell is?! Oh shit, you're right, I'm burning! AAAAAAAA!!!!"
You had it: people whose hair didn't smell when burning probably died more often, skewing the chances of survival towards smelly-when-on-fire hair.
Not what I was wondering about, but thanks.
How often were people catching on fire and not noticing that this would cause any kind of selection criteria?
Does the subject's awareness of the selection matter?
The premise here was that they noticed in time to not die... So, yes?
Ah I misread it.
I reckon it's not so much about noticing in absolute terms (to notice vs not to notice), but rather about the smallest difference that smelly hair would make. Amplify that over millions of years and smelly hair has a good chance of being everywhere eventually.
I dunno. I'm just having trouble conceptualizing any kind of scenario that could happen with enough frequency to cause this trait to be selected for.
I think it's more likely that the chemicals in hair just happen to smell bad when burnt. Those chemicals may have been filtered for other reasons.
Yea that could also very well be, that it was pre-existing and had no impact during evolution. I could see there being an evolutionary advantage to hair smelling bad. That's as far as my confidence and knowledge reaches on the matter. Very interesting nonetheless! :)