The indefatigable Bryan Appleyard rightly criticises Michio Kaku's latest book, Physics of the Impossible, for its naive technophilic populism.
Appleyard is interested in putting such work into an overall cultural context. Science, however, can also put human culture into context, and those seeking the most sophisticated field of view will be rewarded by flipping back and forth between the two perspectives.
Kaku is one of those individuals who has forged an international media career by making wildly exaggerated, and often inaccuarate claims, about the content of modern physics. For a more reliable guide to the science, John Barrow's eclectic 1998 book, Impossibility: The Limits of Science and the Science of Limits, should be consulted. It can be freely downloaded here.