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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The human body produces and destroys 15 million blood cells every second.
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There are more sensory neurons in the tongue than in any other part of the body.
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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.