Yawns are more contagious among people with closer relationships.
163
Your thumb is about the same size as your nose.
124
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Your heart will pump about 212 million liters in its lifetime.
26
Chewing gum boosts your brain power.
285
Enamel is hardest substance in the human body.
61
When you take a step, you are using up to 200 muscles.
886