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Did you know?
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.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.