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As the civil war in Syria enters its third year, there is much discussion of the regime’s chemical weapons and whether Syria’s Bashar al-Assad will unleash them against Syrian rebels, or whether a power vacuum after Assad’s fall might make those horrific tools available to the highest bidder. The conversation centers on Syria’s chemical weaponry, not on something vastly more serious: its nuclear weaponry. It well might have. This is the inside story of why it does not.