It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A hard working adult sweats up to 4 gallons per day.
39
According to Harris Interactive, 70% of men and 57% of women shower daily.
75
Roughly a quarter of the world's people live in China.
50
Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
99
Most people smile when they are frustrated, according to a study.
15
Babies cry but they don't produce tears until one to three months after birth.
238