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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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There are 20 feet of blood vessels in each square inch of human skin.
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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.