The average sperm cell swims at 8 inches per hour.
76
One human hair can support 3 ounces.
191
Yawns are more contagious among people with closer relationships.
163
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Your heart will pump about 212 million liters in its lifetime.
26
Enamel is hardest substance in the human body.
61
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111