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
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Pain occurs when sounds are above 130 db.
124
By weight, Bone is five times stronger than steel.
417
Gorillas can catch human colds and other illnesses.
205
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A man's beard grows fastest when he anticipates sex.
239