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A portion of Australia's Great Barrier Reef photographed from the International Space Station. The Flinders Reef area of the Great Barrier Reef is one of 11 sites around the world where scientists are looking for decisive geological evidence of a new epoch called the anthropocene. M. Justin Wilkinson, Texas State U., Jacobs Contract at NASA-JSC/NASA hide caption

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M. Justin Wilkinson, Texas State U., Jacobs Contract at NASA-JSC/NASA

Drawing A Line In The Mud: Scientists Debate When 'Age Of Humans' Began

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A satellite photo of the Punggye-ri nuclear test site in North Korea on Wednesday. Digitalglobe hide caption

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Digitalglobe

North Korea Demolishes Its Nuclear Test Site In A 'Huge Explosion'

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South Korean national security adviser Chung Eui-yong speaks to reporters at the White House Thursday evening. South Korean intelligence chief Suh Hoon is at left. Susan Walsh/AP hide caption

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Susan Walsh/AP

In May 1962, the U.S. conducted its first and only test of a nuclear-tipped missile. Some worry North Korea could try something similar. United States Navy/Science Faction/Getty Images hide caption

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United States Navy/Science Faction/Getty Images

How North Korea's Nuclear Tests Could Get Even More Terrifying

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A still from a film recently digitized by a team at Lawrence Livermore National Laboratory. The film shows a 1958 explosion at Bikini Atoll in the Marshall Islands. Screen grab by NPR/YouTube hide caption

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Screen grab by NPR/YouTube