Enamel is hardest substance in the human body.
61
The human brain has the capacity to store everything that you experience.
4k
Every year your body replaces 98% of your atoms.
119
The average sperm cell swims at 8 inches per hour.
76
Poor eyesight (myopia) is associated with higher IQ.
232
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Yawns are more contagious among people with closer relationships.
163