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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Asthma cases in Americans are about 75% higher today than they were in 1980.