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Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

A plant infected with tobacco mosaic virus A plant infected with tobacco mosaic virus
Summary of events in the killing of virus-infected cells by cytotoxic T cells. Summary of events in the killing of virus-infected cells by cytotoxic T cells.
Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d
HIV cycle in an infected cell: (a) latent infection; (b) active infection. HIV cycle in an infected cell: (a) latent infection; (b) active infection.
Risk assessment codes for an HIV-infected patient. Risk assessment codes for an HIV-infected patient.
Saprolegnia on an Infected Fish Saprolegnia on an Infected Fish
Video: Passive Smoke Exposure

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