Enamel is hardest substance in the human body.
61
Your thumb is about the same size as your nose.
124
Your heart will pump about 212 million liters in its lifetime.
26
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Yawns are more contagious among people with closer relationships.
163
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The world's shortest man measures only 21.5 inches.
73