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
The average person's skin weighs twice as much as their brain.
131
The human brain doesn't stop developing until about 25 years old.
102
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
A person can live without food for about a month, but only about a week without water.
156
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
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99