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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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.