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Watch Live: Biden's Inauguration Day

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Joe Biden and Kamala Harris are being sworn in as the president and vice president of the United States. Watch the ceremony, inaugural address and other celebratory events throughout the day.

The U.S. House of Representatives is taking up a resolution that would call on Vice President Pence to invoke the 25th Amendment and take over President Trump's duties. The effort comes as the House is also pursuing a second impeachment against the president over the insurrection at the Capitol on Jan. 6. Watch the House proceedings live:

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.