Most people smile when they are frustrated, according to a study.
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Roughly a quarter of the world's people live in China.
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If you're over 100 years old, there's an 80% chance you're a woman.
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Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this.
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Americans throw out 4.5 pounds of trash a day - twice that of 40 years ago.
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Approximately 4 to 5% of the U.S. population has one or more clinically significant phobias in a given year. Specific phobias occur in people of all ages. The average age of onset for social phobia is between 15 and 20 years of age, although it can often begin in childhood.
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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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