The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
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
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
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
If the human eye was a digital camera, it would have 576 megapixels.
25
