The horizontal fraction bar was introduced by the Arabs.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
World Crude Oil Production, 1900–2010
World Crude Oil Production and Reserves (Billions of Barrels)
Production efficiency vs. trophic efficiency
A comparison of sperm production and egg production in humans