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David Goldman/AP

Republican Donald Trump and Democrat Hillary Clinton face off in the third and final presidential debate Wednesday night at the University of Nevada, Las Vegas.

NPR's politics team, with help from reporters and editors, is live annotating the debate. Portions of the debate with added analysis are highlighted, followed by context and fact check from NPR reporters and editors.

David Goldman/AP

Republican Donald Trump and Democrat Hillary Clinton face off in the second presidential debate Sunday night at Washington University in St. Louis, Missouri.

NPR's politics team, with help from reporters and editors who cover national security, immigration, business, foreign policy and more, is live annotating the debate. Portions of the debate with added analysis are highlighted, followed by context and fact check from NPR reporters and editors.

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Mandel Ngan/AFP/Getty Images

Democrat Tim Kaine and Republican Mike Pence square off in the vice-presidential debate Tuesday night.

NPR's politics team, with help from reporters and editors who cover national security, immigration, business, foreign policy and more, is live annotating the debate. Portions of the debate with added analysis are highlighted, followed by context and fact check from NPR reporters and editors.

In 1957, Joel Healy witnessed one of the largest nuclear tests ever conducted on U.S. soil.

Healy was in the U.S. Army, stationed in the Nevada desert north of Las Vegas at Camp Desert Rock. He was 17 years old and a private first class at the time.

Healy drove dump trucks, moved materials, and built structures, like houses, that would be destroyed by the explosions so the Army could study the effects of a nuclear blast. He also helped build the towers where many of the bombs were detonated.

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