During a typical human life span, the human heart will beat approximately 2.5 billion times.
21
Enamel is hardest substance in the human body.
61
When you take a step, you are using up to 200 muscles.
886
The human heart creates enough pressure to squirt blood 30 ft.
37
Pain travels through the body at 350 feet per second!
23
A woman's sense of smell is most sensitive during ovulation.
34
Flu shots only work about 70% of the time.
18
While 7 men in 100 have some form of color blindness, only 1 woman in 1,000 suffers from it.
50