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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The horizontal fraction bar was introduced by the Arabs.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.