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Thyroid conditions may make getting pregnant impossible.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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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.