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  • 19 votes cast
Aug
27
comment Do birds emit infrared?
Technically, all objects emit infrared, not just those "with a temperature higher than the background". It's true however, that to photograph such an object with any sort of contrast, one would need the temperature to be higher.
Jan
7
comment Why does human facial and head hair continue to grow?
@nico, I agree, but that's the OP's question.
Jan
7
comment Do octopuses have better eyes than humans?
So if a diver and an octopus where to be threatened by a shark, the octopus would see the shark first?
Jan
7
comment Do octopuses have better eyes than humans?
the blind spot perhaps not, (although it could come in ahndy if the eyes are on the side of your head and not in front), but mostly one would think that the lack of nerve fibers would somehow improve resolution, vision in dim light, etc.
Jan
7
comment Why does human facial and head hair continue to grow?
Yet non answer the question - how is longer hair advantageous.
Jan
7
comment Do octopuses have better eyes than humans?
I'd suggest adding the tag "cephalopods".