An undated picture provided by the official Korean Central News Agency earlier this month shows North Korean leader Kim Jong Un talking with scientists and technicians. North Korea's nuclear warhead was jokingly dubbed "the disco ball," but experts say the spherical device, while likely a model, is probably based on a real nuclear weapons design. KCNA/EPA via Corbis hide caption

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KCNA/EPA via Corbis

Why Analysts Aren't Laughing At These Silly North Korean Photos

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Samantha Power, the U.S. Ambassador to the United Nations, says the proposed resolution sanctioning North Korea "is the toughest sanctions resolution that has been put forward in more than two decades." Mark Lennihan/AP hide caption

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Mark Lennihan/AP

U.S. Proposes Tough New Sanctions On North Korea — With China's Support

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South Koreans watch a report on North Korea's TV announcement that it had successfully conducted a hydrogen bomb test. North Korea's neighbors have condemned the nuclear test, which is still being verified. Jeon Heon-Kyun/EPA/Landov hide caption

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Jeon Heon-Kyun/EPA/Landov

Inside a nondescript building at Los Alamos National Laboratory known as TA-66, nuclear weapons inspectors are carefully trained in the detection of plutonium. Courtesy of Los Alamos National Laboratory hide caption

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Courtesy of Los Alamos National Laboratory

How Do You Find Plutonium? Go To Nuclear Inspector School

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The U.N. Security Council endorsed the historic Iran nuclear deal on Monday. Now, world leaders — notably in the U.S. and Iran — must garner enough support for the agreement at home. Seth Wenig/AP hide caption

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Seth Wenig/AP

Parrying Doubts In Two Capitals, Leaders Sell The Iran Nuclear Deal

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Obama Sees Long Legacy For Iran Deal; GOP's 2016 Candidates Want It Gone

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Interview: Israeli Prime Minister Bejamin Netanyahu On Iran Nuclear Deal

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Iran Nuclear Deal Leaves Plenty Of Room For Disagreement

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Secretary of State John Kerry (left), and Russian Foreign Minister Sergey Lavrov (right) wait for the start of a meeting at the Beau Rivage Palace Hotelin Lausanne, Switzerland, on Sunday to discuss a nuclear deal on Iran. Brendan Smialowski/AP hide caption

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Brendan Smialowski/AP

Lt. Raj Bansal and Capt. Joseph Shannon (right) approach Foxtrot-01, a remote nuclear missile base in Nebraska. Geoffrey Brumfiel/NPR hide caption

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Geoffrey Brumfiel/NPR

Welcome To The Nuclear Command Bunker

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A worker rides a bicycle in front of the Bushehr nuclear power plant in Iran in 2010. Iran and six world powers are meeting in Vienna this week with the goal of reaching a comprehensive deal on Iran's nuclear program before a July 20 deadline. Majid Asgaripour/Mehr News Agency/AP hide caption

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Majid Asgaripour/Mehr News Agency/AP

The second atomic bomb test at Bikini Atoll on July 25, 1946. The Marshall Islands, where Bikini is located, is suing the U.S. for what it calls a violation of the Nuclear Non-Proliferation Treaty. Anonymous/AP hide caption

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Anonymous/AP

An Aug. 31 image from DigitalGlobe shows the 5-megawatt reactor at North Korea's Yongbyon facility. South Korean officials say they have confirmed that the nuclear reactor has been restarted. DigitalGlobe/ScapeWare3d/via Getty Images hide caption

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DigitalGlobe/ScapeWare3d/via Getty Images

Nuclear bomb tests like this one, conducted at the Nevada Test Site in 1957, are helping scientists understand how the human body works. Photo courtesy of National Nuclear Security Administration / Nevada Site Office hide caption

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Photo courtesy of National Nuclear Security Administration / Nevada Site Office