The first semi-permanent settlements appeared in Florida around 5000 B.C.
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Approximately 4 to 5% of the U.S. population has one or more clinically significant phobias in a given year. Specific phobias occur in people of all ages. The average age of onset for social phobia is between 15 and 20 years of age, although it can often begin in childhood.
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During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
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A Native American tribe in South Dakota collects bottle caps left by campers, using them as currency. Several banks in the area now recognize the caps as legal tender.
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In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
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