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Physicist Brian Greene was propelled into the spotlight thanks to The Elegant Universe, his bestseller on string theory. Now he's turned his attention to parallel worlds. He tells Amanda Gefter about his favourite multiverse, why we might be living in a computer simulation and the questions that keep him awake at night

On October 11, 2010, Laura Mersini-Houghton appeared in a BBC programme What Happened Before the Big Bang (along with Michio Kaku, Neil Turok, Andrei Linde, Roger Penrose, Lee Smolin and other notable cosmologists and physicists) where she propounded her theory of the universe as a wave function on the landscape multiverse.[11] The programme referred to three observational tests of her theory's predictions, which makes it the only theory on the origins of our universe ever to offer predictions and have them successfully tested. Mersini-Houghton's work on multiverse theory is discussed in the epilogue of a recently published biography of Hugh Everett III.[12