Your body is creating and killing about 2.4 million red blood cells per second.
17
Your thumb is about the same size as your nose.
124
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Within three days of death, the enzymes that once digested your food begin to eat you.
22
The average sperm cell swims at 8 inches per hour.
76
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127