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How do scientists determine if a nuclear blast has occurred?

science.howstuffworks.com/nuclear-detection.htm

In the first reports released since North Korea announced its underground nuclear test on Monday, officials are saying they have found no evidence of a nuclear signature in the air above the blast site.

How Japan's Nuclear Crisis Works

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Explosions, fires and dangerous radiation levels dominated the headlines after the March 11 earthquake and tsunami sparked a nuclear crisis in Japan. How did so many safety measures fail?

Is it possible to run a nuclear test without producing radioactive fallout?

science.howstuffworks.com/nuclear-test.htm

In what may prove to be the first nuclear explosion since 1998, North Korea claims it has conducted an underground test of a nuclear weapon.

How does nuclear waste disposal work?

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Nuclear waste epitomizes the double-edged sword of modern technology. It's a toxic and radioactive byproduct of nuclear medicine, nuclear weapons manufacturing and nuclear power plants.

How Nuclear Bombs Work

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Nine countries hold the 13,000 nuclear weapons in the global stockpile. That's less than during the Cold War but it doesn't change the fact that these bombs are still a threat to global humanity. So how do they work and are we close to nuclear war?

What would nuclear winter be like?

science.howstuffworks.com/nuclear-winter.htm

If the sight of a mushroom cloud burning above the horizon suggests that the nuclear weapon-equipped world might end with a bang, then nuclear winter presents the notion that post-World War III humanity might very well die with a whimper.

How Nuclear Medicine Works

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Nuclear materials get used in many forms of nuclear medicine -- everything from PET scans to chemotherapy uses them. Learn how nuclear medicine works.

How the Nuclear Arms Race Works

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The nuclear arms race was a frantic era in which several nations tested nuclear technology and stockpiled warheads. Read about the nuclear arms race.

How Power Grids Work

science.howstuffworks.com/environmental/energy/power.htm

Electrical power is a little bit like the air you breathe: You don't really think about it until it is missing. There are good reasons the power grid distribution system works the way it does, though it can lead to some big problems.

5 Worst Nuclear Disasters in the World

history.howstuffworks.com/historical-events/worst-nuclear-disasters-in-world.htm

Nuclear power plant accidents are rare, but when they happen, there can be lasting effects from the radiation. Here are history's most horrific accidents.

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