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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Boundaries within landscapes created by human activity (background) and natural environmental gradie Boundaries within landscapes created by human activity (background) and natural environmental gradie
The Venus flytrap, a species of carnivorous plant. The Venus flytrap, a species of carnivorous plant.
The pH of human blood ranges from 7.35 to 7.45. The pH of human blood ranges from 7.35 to 7.45.
Major features of human genome Major features of human genome
The regions of the human X chromosome distinguished by its banding pattern The regions of the human X chromosome distinguished by its banding pattern
Similar-looking, related species that are native to distant geographic realms Similar-looking, related species that are native to distant geographic realms
Video: Eczema

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