Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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Yu Youzhen, a Chinese millionaire, works as a street sweeper for the sanitation department to set an example for her children.
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A hard working adult sweats up to 4 gallons per day.
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Children laugh about 400 times a day, while adults laugh on average only 15 times a day.
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Roughly a quarter of the world's people live in China.
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Only 10-20% of the population can wiggle their ears and raise one eyebrow.
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