When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Only about 2% of the world population has green eyes.
36
The human eye blinks an average of 4,200,000 times a year.
233
Tigers can see 6 times better at night than humans.
305
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22