Time travel turns out to be routine for subatomic particles. Kaku has no problem with UFOs, despite concern that physical evidence for their existence remains steady at zero. Death rays already exist in the form of huge lasers the hand-held variety depicted in Men in Black will require ingenious miniaturization possibly achievable by 2100. Invisibility, for example, may be just around the corner: Researchers already divert light waves around tiny objects in the laboratory, and converting this into Harry Potter’s cloak of invisibility merely requires a few decades to a century of scientific progress. In ten of these chapters, Kaku cheerfully concludes that technical breakthroughs will bring these futuristic marvels into our lives, and he has high hopes for another three. He divides 15 chapters into the not-impossible (invisibility, death rays, telepathy, power from antimatter), possibly impossible (time travel, parallel universes) and probably impossible (perpetual-motion machines, precognition). Kaku ( Parallel Worlds: A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos, 2004, etc.) provides lucid explanations of gee-whiz wonders from science-fiction books, television and films.
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