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This undated photo provided by the National Nuclear Security Administration shows the last B53 nuclear bomb. It was dismantled this past week, just outside Amarillo, Texas. It's a milestone in efforts to reduce the number of nuclear weapons.

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National Nuclear Security Administration/AP
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Pakistani security personnel stand alert on a street in Quetta in September. Proposed appropriations bills in both the U.S. House and Senate make economic and military assistance to Pakistan conditional. Banaras Khan/AFP/Getty Images hide caption

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Banaras Khan/AFP/Getty Images
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