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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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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.

Types of obligatory salt and water exchanges in a terrestrial animal. Types of obligatory salt and water exchanges in a terrestrial animal.
Biotic interactions within and among three Aspen Parkland community types, drawn by Bird Biotic interactions within and among three Aspen Parkland community types, drawn by Bird
Types of tissue in the human body. Types of tissue in the human body.
Two types of front-engine, front-wheel drive. Two types of front-engine, front-wheel drive.
Examples of the Types of Cards Used in a Test of Inductive Reasoning Examples of the Types of Cards Used in a Test of Inductive Reasoning
Types of ecosystem service vs. total global value per year Types of ecosystem service vs. total global value per year
Video: Optic Nerve and Optic Disk Animation (Part 1 of 2)

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