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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 most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.