A human being loses an average of 40 to 100 strands of hair a day.
133
The average sperm cell swims at 8 inches per hour.
4
Poor eyesight (myopia) is associated with higher IQ.
232
On average, there's 100 billion neurons in the human brain.
83
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
Enamel is hardest substance in the human body.
61