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 brain doesn't stop developing until about 25 years old.
102
Your stomach produces a new layer of mucus every two weeks so that it doesn't digest itself.
160
Sex burns about 360 calories per hour.
860
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
When you take a step, you are using up to 200 muscles.
886
Your ribs move about 5 million times a year, every time you breathe!
60