An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
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
Yawns are more contagious among people with closer relationships.
163
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
You can't tickle yourself.
29