The authoritative guide to ensuring science and technology make life on Earth better, not worse.

Virtual Tour

Images and artifacts from the Turn Back the Clock virtual exhibit. Take the tour here. 

How the Bulletin of the Atomic Scientists got its start

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Martyl Langsdorf, designer of the Doomsday Clock

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Virtual Tour: Turn Back the Clock

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Watch the 2025 Doomsday Clock announcement on January 28