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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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The familiar sounds of your heart are made by the heart's valves as they open and close.