It takes about 20 seconds for a red blood cell to circle the whole body.
102
The aorta, the largest artery in the body, is almost the diameter of a garden hose.
37
Your heart pumps about 2,000 gallons of blood each day!
53
Enamel is hardest substance in the human body.
61
A person infected with the SARS virus, has a 95-98% chance of recovery.
23
Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine.
202
In older people, memory is best early in the morning and then declines during the late afternoon.
33
The right lung takes in more air than the left.
30