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Thyroid conditions may make getting pregnant impossible.
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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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The average adult has about 21 square feet of skin.
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There are more sensory neurons in the tongue than in any other part of the body.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.