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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A person will create enough saliva to fill two average size swimming pools during his lifetime.
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Intelligent people have more zinc and copper in their hair.
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Babies crawl an average of 200m a day.
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The average American spends a third of their overall time online playing games and using social networks.
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People in parts of Western China put salt in their tea instead of sugar.
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In Haiti, only 1 out of every 200 people own a car.
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About 3000 years ago, most Egyptians died by the time they were 30!
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