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Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.

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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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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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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Artist's rendition of the view from a hypothetical airless planet orbiting Alpha Centauri A Artist's rendition of the view from a hypothetical airless planet orbiting Alpha Centauri A
Meningocele. (a) A meningocele is a herniation of the meninges, usually associated with the spinal c Meningocele. (a) A meningocele is a herniation of the meninges, usually associated with the spinal c
A schematic view of ribosome subunit rotational motions, based on crystal structures of ribosomes A schematic view of ribosome subunit rotational motions, based on crystal structures of ribosomes
Anterior view of muscles of the human body Anterior view of muscles of the human body
Internal structure of the nose—lateral view Internal structure of the nose—lateral view
Modern house door design Modern house door design
Video: Nerve Impulse Transmission Animation

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