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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Babies that are breastfed are more likely to be slimmer as adults than those that are not breastfed.
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Most people smile when they are frustrated, according to a study.
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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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People in parts of Western China put salt in their tea instead of sugar.
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A chance of a woman having twins is increased after the age of 35. About 1 in 27 women will give birth to twins after this age. After 50 the chances of having twins is 1 in 9.
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