The average person's skin weighs twice as much as their brain.
131
Your thumb is about the same size as your nose.
124
Yawns are more contagious among people with closer relationships.
163
Chewing gum boosts your brain power.
285
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
Enamel is hardest substance in the human body.
61