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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Only 10-20% of the population can wiggle their ears and raise one eyebrow.
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On average women can hear better than men.
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Babies cry but they don't produce tears until one to three months after birth.
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Research has determined that most people are happiest at 7:26pm on a Saturday night.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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According to some estimates, Americans are sitting on $30 billion worth of unredeemed gift cards.
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