The human sigh acts as a physiological reset button.
23
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
The human brain is more active during sleep than during the day.
28
The average person will go on a date at least 100 times before they finally marry.
33
One human hair can support 3 ounces.
191
Pain occurs when sounds are above 130 db.
124
Enamel is hardest substance in the human body.
61
Your thumb is about the same size as your nose.
124