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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 longest a person has survived after a heart transplant is 24 years.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.