The first semi-permanent settlements appeared in Florida around 5000 B.C.
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In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
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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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In 1963, the US Military created an artificial ring around Earth, similar to that of the planet Saturn. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.
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The Internal Revenue Service audits 87 percent of women who claim breast implants as tax deductions.
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According to a 2014 study, 1 in 10 Americans think HTML is a sexually-transmitted disease.
8
Wyoming has only 2 sets of escalators in the entire state.
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