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Did you know?

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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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

skin of a spider skin of a spider
Photomicro graph showing the three layers of the skin. Photomicro graph showing the three layers of the skin.
Transactional model of cancer Transactional model of cancer
Pigmented bands in nail of patient with dark skin Pigmented bands in nail of patient with dark skin
Obtained from the deadly nightshade plant Atropa belladona, atropine remains a traditional drug ... Obtained from the deadly nightshade plant Atropa belladona, atropine remains a traditional drug ...
(a) Blue arrows (right side): External components of the innate immune system: human body with skin, ... (a) Blue arrows (right side): External components of the innate immune system: human body with skin, ...
Video: Autonomic Nervous System Animation

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