The average sperm cell swims at 8 inches per hour.
76
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human brain doesn't stop developing until about 25 years old.
102
Enamel is hardest substance in the human body.
61
One human hair can support 3 ounces.
191
Your heart will pump about 212 million liters in its lifetime.
26