Vaccines prevent between 2.5 and 4 million deaths every year.
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The horizontal fraction bar was introduced by the Arabs.
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Everyone has one nostril that is larger than the other.
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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Species richness increases with island size.
lower surface of Arabidopsis thaliana leaf, showing a trichome
Downwelling occurs when surface waters cool, and also when they lose moisture through evaporation. ...
How to approximate the area of a function using midpoints