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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Energy flows in a typical gasoline-powered car
Patient with typical rheumatoid arthritis contractures.
Recommended vs. Typical Diet
A typical aboveground oil storage tank.
Wiring diagram of a typical Ford electronic ignition.
A typical camshaft-driven high-pressure pump used to increase fuel pressure to 2,000 PSI or higher.