For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Chewing gum boosts your brain power.
285
Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
Every year your body replaces 98% of your atoms.
119