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How Israel's Iron Dome Defense System Works

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Israel's Iron Dome defense system is capable of intercepting - and destroying - thousands of incoming rockets targeting civilian areas. Here's how the sophisticated system works.

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?

How Jerusalem Syndrome Works

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Jerusalem Syndrome is the result of becoming overwhelmed when visiting the city of Jerusalem. Find out how visiting Jerusalem can cause Jerusalem Syndrome.

How Jet Lag Works

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Jet lag can be a drain on any long-distance trip. Learn about what causes jet lag and the best ways to prevent and deal with jet lag at Discovery Health.

How Jet Packs Work

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Thanks to several technological advancements, are jet packs closer than ever to becoming a reality for the average person? Find out how jet packs work.

How Kaleidoscopes Work

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Kaleidoscopes have been fascinating people since the early 19th century. Whether you think of kaleidoscopes as toys or as works of art, no matter how often you look inside, you'll never see the same thing twice.

How Kill A Watt Works

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Kill A Watt is a new type of energy monitor. Learn about Kill A Watt.

How Kin Selection Works

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We're used to taking the phrase "survival of the fittest" to mean it's an "every man for himself" world. But some animals (like worker bees) sacrifice themselves to ensure their species lives on. Why would they do this?

How Krispy Kremes Work

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If you've ever tasted a Krispy Kreme original glazed doughnut, you know there's something special to these melt-in-your-mouth treats. How do they make a doughnut that's crispy outside yet soft inside? Find out.

How Kudzu Works

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Kudzu is explained in this article. Learn about kudzu.