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Thyroid conditions may make getting pregnant impossible.

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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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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Body plan of a crustacean, as represented by a shrimp Body plan of a crustacean, as represented by a shrimp
Countercurrent heat exchange in dolphin flippers promotes conservation of body heat. Countercurrent heat exchange in dolphin flippers promotes conservation of body heat.
Major fluid compartments in the body Major fluid compartments in the body
(a) Masai from East Africa have body types adapted to warm climates. (a) Masai from East Africa have body types adapted to warm climates.
The two TP sensors used on the throttle body of an electronic throttle body assembly produce ... The two TP sensors used on the throttle body of an electronic throttle body assembly produce ...
Insect Body Plan: Grasshopper Insect Body Plan: Grasshopper
Video: Stroke volume - afterload definition & hypertension

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