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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

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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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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

The respiratory system is assessed for ventilatory changes. The respiratory system is assessed for ventilatory changes.
The acetic acid–acetate pair as a buffer system The acetic acid–acetate pair as a buffer system
Autonomic Nervous System Autonomic Nervous System
Functional divisions of the nervous system. Functional divisions of the nervous system.
Typical wiring diagram of a V-6 distributorless (direct fire) ignition system. Typical wiring diagram of a V-6 distributorless (direct fire) ignition system.
The Autonomic Nervous System The Autonomic Nervous System
Video: Introduction to Sickle Cell Anemia

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