Roughly a quarter of the world's people live in China.
50
There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
Most of the world's people must walk at least 3 hours to fetch water!
38
According to the American Society for Microbiology, 90% of women and 75% of men wash their hands after using a public restroom.
170
Yawns are more contagious among people with closer relationships.
163
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Most people smile when they are frustrated, according to a study.
15
