The single biggest predictor of love is proximity.
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Babies' eyes do not produce tears until the baby is approximately six to eight weeks old.
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Yawns are more contagious among people with closer relationships.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Two in five people in the world marry their first love.
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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.
20