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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Thyroid conditions may make getting pregnant impossible.
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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.