http://d.yimg.com/a/p/afp/20100412/c...cnH3gKOyDoLw--AP - President Barack Obama optimistically opened a 47-nation nuclear summit Monday, boosted by Ukraine's announcement that it will give up its weapons-grade uranium. More sobering: The White House counterterror chief warned that al-Qaida is vigorously pursuing ingredients and expertise for a bomb.
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