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Hoover Dam's concrete could pave a road across America

The concrete in Hoover Dam and its works would pave a highway 16 feet wide from San Francisco to New York City.

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That is 4,360,000 cubic yards. The dam stands 726.4 feet from foundation rock to the roadway on its crest and weighs more than 6,600,000 tons.

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Open U.S. Bureau of Reclamation

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The Gateway Arch is as wide as it is tall

The Gateway Arch is 630 feet tall and 630 feet wide from one outer leg to the other.

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The founder of the Nobel Prize invented dynamite

Alfred Nobel, who invented dynamite, held 355 patents.

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Jamestown was England's first lasting American colony

In 1607 England established Jamestown, its first permanent colony in America.

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