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

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

The effects of elevated atmospheric CO2 on insect herbivores. The effects of elevated atmospheric CO2 on insect herbivores.
Herbivores must overcome the wide variety of physical and chemical defences evolved by plants. Herbivores must overcome the wide variety of physical and chemical defences evolved by plants.
In some species, dominant females have more surviving offspring that mature earlier indicating an ad In some species, dominant females have more surviving offspring that mature earlier indicating an ad
The Distribution of Dominant and Minority Groups The Distribution of Dominant and Minority Groups
Transmission of autosomal dominant disorders (50% chance for an affected child). Transmission of autosomal dominant disorders (50% chance for an affected child).
Polydactyly is an autosomal dominant trait with incomplete penetrance Polydactyly is an autosomal dominant trait with incomplete penetrance
Video: Body plan of euglena Animation

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