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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Babies cry but they don't produce tears until one to three months after birth.
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Children grow faster in the springtime than any other season during the year.
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Studies suggest that people who appear to be constantly distracted have more "working memory" and "sharper brains".
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Most people smile when they are frustrated, according to a study.
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Americans throw out 4.5 pounds of trash a day - twice that of 40 years ago.
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