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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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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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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
The spongy bone in the top of the femur changes density and organization during growth. The spongy bone in the top of the femur changes density and organization during growth.
The “Old Man” from La Chapelle shows evidence of extensive tooth loss and bone resorption. The “Old Man” from La Chapelle shows evidence of extensive tooth loss and bone resorption.
skeletal muscle consists of a group of fibers held together by connective tissue. It is enclosed in ... skeletal muscle consists of a group of fibers held together by connective tissue. It is enclosed in ...
The upper intake manifold, often called a plenum, attaches to the lower intake manifold. The upper intake manifold, often called a plenum, attaches to the lower intake manifold.
Connective Tissue Covering of Spinal Nerves Connective Tissue Covering of Spinal Nerves
Video: Sperm Formation

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