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
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Tigers can see 6 times better at night than humans.
305
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
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k