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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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The horizontal fraction bar was introduced by the Arabs.

Dissimilar organisms with similar approaches to desert living. Dissimilar organisms with similar approaches to desert living.
The process of phagocytosis: a phagocyte engulfing bacteria or other foreign material. The process of phagocytosis: a phagocyte engulfing bacteria or other foreign material.
Organic obstructions of the intestinal tract. Organic obstructions of the intestinal tract.
Chemical, Biochemical, and Organic Sedimentary Rocks Chemical, Biochemical, and Organic Sedimentary Rocks
Four essential organic compounds Four essential organic compounds
Regulation can occur at any stage in the expression of genetic material in eukaryotes Regulation can occur at any stage in the expression of genetic material in eukaryotes
Video: Bulk flow - factors that influence bulk flow

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