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The average adult has about 21 square feet of skin.

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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Burn Degree By Tissue Layer Burn Degree By Tissue Layer
An 1827 portrait by George Catlin of Eeh-Nis-Kin (Crystal Stone), a Blackfoot woman. An 1827 portrait by George Catlin of Eeh-Nis-Kin (Crystal Stone), a Blackfoot woman.
Embryonic Period - By the second day after fertilization Embryonic Period - By the second day after fertilization
Embryonic Period Embryonic Period
Embryonic Period Embryonic Period
Estimated number of new HIV infections per year over time period in Canada Estimated number of new HIV infections per year over time period in Canada
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