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
The human eye blinks an average of 4,200,000 times a year.
233
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Tigers can see 6 times better at night than humans.
305
Only about 2% of the world population has green eyes.
36
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
The colossal squid has the largest eyes in the world.
4
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132