单词：p-aminobenzene sulfonic acid (sulfanilic acid)
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President Obama says an al-Qaeda affiliate in Yemen was apparently behind the failed attempt to blow up a jetliner bounded for Detroit last week. Mr. Obama said today he thinks about the nation's security every moment of every day. NPR's Renita Jablo
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Scientists Create Blackest Material Ever Of all the black things in the universe only the infamous black holes are so black that not even a tiny amount of light can bounce back. But scientists have managed to create material almost as black, and it h
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