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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are more bacteria in your mouth than there are people in the world.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.