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Time travel, death stars and invisibility cloaks - writer and noted scientist, Michio Kaku, believes they could all be possible in the not to distant future.
To the skeptics he points out that aeroplanes, lasers, televisions and atomic bombs were all considered impossible by scientists in the past.
On Wednesday's Riz Khan we speak with noted scientist Michio Kaku author of Physics of the Impossible.
The book explores the technologies and devices of science fiction that are deemed impossible today but that might become commonplace in the future.
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