The human brain doesn't stop developing until about 25 years old.
102
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
You forget 90% of your dreams.
256
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
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30
The world's shortest man measures only 21.5 inches.
73
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515