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Did you know?
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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are 60,000 miles of blood vessels in every adult human.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.