Critical acclaim for Michio Kaku's previous book, Hyperspace:
"Among the best of its genre to appear in recent years...What a wonderful adventure it is, trying to think the unthinkable!"
--The New York Times Book Review
"A roller coaster of an intellectual ride through the extraordinary world of black holes, wormholes, parallel universes, higher dimensions and time travel."
--Philadelphia Inquirer
"Mesmerizing...the reader exits dizzy, elated and looking at the world in a
literally revolutionary way."
--The Washington Post