Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
By weight, Bone is five times stronger than steel.
417
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
Our Right Lungs takes more air than our left lung.
194
Human hair and fingernails continue to grow after death.
7
We share 70% of our DNA with a slug.
218
Early American humans hunted car-size armadillos and used their shells for houses.
12
One human hair can support 3 ounces.
191