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Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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The average adult has about 21 square feet of skin.

Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
A breech birth. This image illustrates a newborn that has been delivered buttocks first. A breech birth. This image illustrates a newborn that has been delivered buttocks first.
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Second-degree burn. Second-degree burn.
Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ... Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ...
The lifetime risk for schizophrenia varies with the degree of relationship to an affected individual The lifetime risk for schizophrenia varies with the degree of relationship to an affected individual
Video: Morphology of a tomato plant

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