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Are America's plutonium pits too old to perform in the new Cold War? Or are new ones necessary?

The aging of plutonium pits is a big question mark. The potential power they yield is one of the most critical factors in triggering a nuclear explosion. But just as American voters are facing a “contest of the ancients” in this electoral year, so are scientists grappling with the vexing matter of plutonium’s lifespan. ....

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