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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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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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