As if smoke monsters and tropical polar bears weren't enough to keep our heads spinning, Thursday's episode of Lost, "The Constant," opened up a whole new can of worms: the fourth dimension.
Flying from the island toward a mysterious freighter, pilot Frank Lapidus can't keep his helicopter on the bearing that physicist Daniel Faraday says will get Desmond and Sayid to the freighter safely—presumably through a wormhole. They encounter some turbulence, and Desmond begins, yes, traveling through time, with increasingly rapid lapses between 1996 and the present (which, on the show, is still 2004). With new particle physics research recently taking time travel from Doc Brown fantasy to down-the-line possibility, we spoke with Dr. Michio Kaku, whose new book, "Physics of the Impossible," makes Lost's flip-flop between past and present look, well, not impossible.
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