After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
By weight, Bone is five times stronger than steel.
417
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
It takes about 20 seconds for a red blood cell to circle the whole body.
102
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
On average a woman has 4 sexual partners in her lifetime.
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