It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Yawns are more contagious among people with closer relationships.
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Humans blink over 10,000,000 times a year!
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According to Harris Interactive, 70% of men and 57% of women shower daily.
75
The average person falls asleep in seven minutes.
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