Most people smile when they are frustrated, according to a study.
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People in parts of Western China put salt in their tea instead of sugar.
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The average American consumes 9 pounds of food additives every year.
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The higher the income, the more likely an American man will cheat on his wife.
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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
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