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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.