The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Enamel is hardest substance in the human body.
61
Your heart will pump about 212 million liters in its lifetime.
26
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
Yawns are more contagious among people with closer relationships.
163
One human hair can support 3 ounces.
191
Your thumb is about the same size as your nose.
124