There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
As many as one third Americans flush the toilet while they are still on it.
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In 2002, Kenyan Maasai tribespeople donated 14 cows to the US to help with the aftermath of 9/11.
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90% of people sit at their computer desk slouching, supporting their head with their left hand.
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Females learn to talk earlier, use sentences earlier, and learn to read more quickly than males.
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On average women can hear better than men.
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