Art Bell welcomes theoretical physicist Dr. Michio Kaku to discuss his book Einstein's Cosmos and the approaching 100th anniversary of relativity. The conversation ranges from the GPS system's dependence on Einstein's equations to the nature of time travel, with Dr. Kaku explaining that forward time travel is already proven through satellite measurements while backward time travel remains theoretically possible through hundreds of solutions to Einstein's general relativity equations. Dr. Kaku… Full show notes & guests: https://artbellarchive.org/episode/may-16-2004-life-of-einstein-dr-michio-kaku