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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are more nerve cells in one human brain than there are stars in the Milky Way.