Tomorrow, in an effort to recreate the conditions that followed the big bang, physicists will flip the switch on a gigantic particle accelerator--the Large Hadron Collider. Skeptics fear this will be the end of the earth, scientists say that planetary annihilation is unlikely. For a reality check we turn to the rock star of all things physics, Brian Greene. Guest: Brian Greene, physicist, author of ?The Elegant Universe,? which was also a WGBH-produced NOVA mini-series on PBS. He has a new book out: ?Icarus at the Edge of Time."

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