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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.
There are 60,000 miles of blood vessels in every adult human.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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 first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.