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.
22
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
If you were to roll a lung from a human body and out flat it would be the size of a tennis court.
36
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
Wearing tight pants can lead to impotence in men.
120
Dating back to the 1600's, thermometers were filled with Brandy instead of mercury.
16
Your ribs move about 5 million times a year, every time you breathe!
60