In 1864, the first barbiturate (barbituric acid) was synthesized.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Variation in the rate of evolution as a function of the strength of selection, assuming genetic drif