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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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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People about to have surgery must tell their health care providers about all supplements they take.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Flower part number is a characteristic difference between monocots and eudicots (a) Flowers and buds Flower part number is a characteristic difference between monocots and eudicots (a) Flowers and buds
Sunlight consists of a spectrum of colors, visible here in a rainbow. Sunlight consists of a spectrum of colors, visible here in a rainbow.
Tube colors, additives, inversions, and laboratory uses. Tube colors, additives, inversions, and laboratory uses.
Difference-Between-Carbohydrates-and-Lipids-infographic Difference-Between-Carbohydrates-and-Lipids-infographic
Resting Membrane Potential: Voltage Difference Resting Membrane Potential: Voltage Difference
Frequency diagrams of skin colors. (a) Skin color distribution in the parents falls into two discont Frequency diagrams of skin colors. (a) Skin color distribution in the parents falls into two discont
Video: Types of Shock (Part 2 of 2)

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