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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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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.