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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.