Men laugh longer, louder, and more often than women.
61
Yawns are more contagious among people with closer relationships.
163
Women mature much faster than men.
1k
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
44% of kids watch television before they go to sleep.
106
Roughly a quarter of the world's people live in China.
50