The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Yawns are more contagious among people with closer relationships.
163
One human hair can support 3 ounces.
191
The average sperm cell swims at 8 inches per hour.
76
The average person's skin weighs twice as much as their brain.
131