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Thyroid conditions may make getting pregnant impossible.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
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Cyanide works by making the human body unable to use oxygen.
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Vaccines prevent between 2.5 and 4 million deaths every year.