A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
The average person's skin weighs twice as much as their brain.
131
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
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Your thumb is about the same size as your nose.
124
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515