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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.