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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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The average adult has about 21 square feet of skin.

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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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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Species richness of birds in North America. Species richness of birds in North America.
Species richness increases with island size. Species richness increases with island size.
Human skull Human skull
Personality over the Life Span Personality over the Life Span
Species-area curves Species-area curves
Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species. Philippine Tarsier (Tarsius syrichta), Philippine Islands, a threatened species.
Video: Blood Flow Through the Kidneys

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