By weight, Bone is five times stronger than steel.
417
We share 70% of our DNA with a slug.
218
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The average sperm cell swims at 8 inches per hour.
4
There are about 255 babies born worldwide every minute.
46
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515