For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The average sperm cell swims at 8 inches per hour.
76
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Chewing gum boosts your brain power.
285
The human brain has the capacity to store everything that you experience.
4k
Yawns are more contagious among people with closer relationships.
163
One human hair can support 3 ounces.
191