It takes about 20 seconds for a red blood cell to circle the whole body.
102
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
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218
A man's beard grows fastest when he anticipates sex.
239
Tigers can see 6 times better at night than humans.
305
You can't tickle yourself.
29