Los Angeles Times
"Something else again ... Gribbin is having fun.... A book that rejoices in paradoxes and delights in reporting that nothing bizarre -- baby universes, bubble universes, universe-sized black holes, energy extraction and time travel through wormholes -- is denied by the laws of physics."
"Gribbin writes entertainingly and makes difficult ideas sound simple."
Times Educational Supplement
"Fascinating ... Gribbin's thought-provoking book is written in the smooth, easy style of professional science journalism.... [It gives] the reader the secure feeling of being in the hands of a competent guide through perplexing territory."
H.C. von Baeyer,
New York Times Book Review