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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35% of the people using personal ads for dating are already married!
23
About 3000 years ago, most Egyptians died by the time they were 30!
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Yawns are more contagious among people with closer relationships.
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According to CNN national security correspondent David Ensore, as of 2002 bin Laden had married four women and fathered roughly 25 or 26 children.
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40% of people who are rejected in romantic love slip into clinical depression.
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