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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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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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Cyanide works by making the human body unable to use oxygen.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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