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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.