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For the first time in decades, the U.S. and Russia have no limits on nuclear weapons

The last major arms control treaty between Russian and the U.S. will expire on Thursday, but experts are cautiously optimistic that there won't be another arms race. At least not right away.

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Geoff Brumfiel
Geoff Brumfiel works as a senior editor and correspondent on NPR's science desk. His editing duties include science and space, while his reporting focuses on the intersection of science and national security.