Every year your body replaces 98% of your atoms.
119
The average sperm cell swims at 8 inches per hour.
76
Chewing gum boosts your brain power.
285
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Enamel is hardest substance in the human body.
61
The human brain doesn't stop developing until about 25 years old.
102
The average person's skin weighs twice as much as their brain.
131