The average adult has about 21 square feet of skin.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
Parts of the Hand Used in Palpation; Dorsal Surface
The Inner Surface of Human Lung
Surface Tension
The Importance of Water
Running Water
Hydrozoan. Hydra, a freshwater species capturing and digesting a water flea.