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The Doomsday Clock Explained

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We don't often like to consider the possibility of a pending nuclear apocalypse, but when we do, the Doomsday Clock comes to mind. The Doomsday Clock has come to symbolize the likelihood of a global catastrophe, but where did the concept originate? Hint: it first debuted as a graphic. Hear the story behind this famous symbol in the following video, then learn how it's being used today.

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