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There are 60,000 miles of blood vessels in every adult human.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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.