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
Wearing headphones for an hour increases the bacteria in your ear 700 times.
233
If you unfolded your brain, it would cover an ironing board.
42
The male fetus is capable of attaining an erection during the last trimester.
75
When you take a step, you are using up to 200 muscles.
886
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
Your heart beats over 100,000 times a day!
54
