The human brain is insensitive to pain.
76
You can alleviate a tickly throat by scratching your ear.
9
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
At age 70, more than 70 percent of men are still potent!
29
Your skin is actually an organ.
88
Redheads require more anesthesia to 'go under' than other hair colors do.
50
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15