"With no specific procedure, man arrived at sweeping conclusions about the universe that have proven to be true."

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In Europe, where the terrorist threat is probably greatest at the moment, the amount of information-sharing that's been taking place, the effectiveness of law enforcement across borders gives us the ability to protect ourselves while still being true to the basic precepts of our liberal democracies. I hope that that continues, and it is something that I think we should be worried about.

— Barack Obama