Yawns are more contagious among people with closer relationships.
163
Each year, around 24,000 Americans are bitten by rats!
65
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A chance of a woman having twins is increased after the age of 35. About 1 in 27 women will give birth to twins after this age. After 50 the chances of having twins is 1 in 9.
51
Children laugh about 400 times a day, while adults laugh on average only 15 times a day.
973
The average person in their lifetime will spend an estimated 20,160 minutes kissing!
212
Roughly a quarter of the world's people live in China.
50