My Discussion Questions On Brian Greene's The Hidden Reality

Brian Greene's idea on parallel universes with copies of us as alternate versions presents a strange dilemma. What would happen if we met our copies of a different parallel universe? Would it affect our own universe and our sense of reality?

Scientists continue to attempt to prove that multiple universes exist. Greene suggests that "if space extends infitely far then there must be realms out there." Would it be beneficial or detrimental to uor reality to discover these other realms?