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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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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.