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mcelrath writes "The LHC turn-on is imminent. Great things will be discovered. Perhaps it will be the Higgs Boson. Perhaps it will be Dark Matter. Maybe we'll even make a black hole. (Though, I'm sorry to say, we won't be destroying the Earth). This is your chance. What have you always wanted to know about particle physics or the LHC? The 10 highest rated comments will be answered (or answers found from CERN experts) by the submitter, an American theoretical physicist employed by CERN."