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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.