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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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.
The average adult has about 21 square feet of skin.