Enamel is hardest substance in the human body.
61
It is almost impossible to sneeze with your eyes open. It is a defense mechanism that has evolved to protect our eyes from bacteria and debris.
164
Human thigh bones are stronger than concrete!
63
The human heart creates enough pressure to squirt blood 30 ft.
37
Fingernails grow nearly 4 times faster than toenails.
31
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Your skin is actually an organ.
88
By the age of 60, most people have lost 50% of their taste buds.
17