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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.
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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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Excessive alcohol use costs the country approximately $235 billion every year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).