Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine.
202
A person will burn 7 percent more calories if they walk on hard dirt compared to pavement.
45
The human brain is insensitive to pain.
76
It takes about 20 seconds for a red blood cell to circle the whole body.
102
In the average lifetime a person will breath in about 44 pounds of dust.
21
Redheads require more anesthesia to 'go under' than other hair colors do.
50
Within three days of death, the enzymes that once digested your food begin to eat you.
22
The average female will have 3.3 pregnancies in her life.
49