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This tag is for questions about the general biological features of human beings (as opposed to the biology of non-humans).

26 votes
Accepted

If human eyes watch an area, what's the shape of its capturing shape? Rectangular? Half sphe...

The capture area of the eye is a bit fuzzier and harder to define than that of a camera. A camera captures consistent, fully detailed data right up to the edge of its sensor, and no data at all beyon …
Jason C's user avatar
  • 638
4 votes
1 answer
5k views

Why do you retch when you see something disgusting?

Why do you retch when you see something disgusting? I imagine it is some sort of evolutionary response, although I can't see the connection between receiving a signal that unhealthy conditions are in …