The legions of fans who buy Bill Bryson's travel books and voted him a favourite author for World Book Day won't quite know what to make of the amiable traveller's latest offering. Transworld has dubbed it "for all those who couldn't understand A Brief History of Time" (and on that basis, if they all buy a copy it will be an instant bestseller). Bryson applies his naturally enquiring mind and his way with words which is both informative and entertaining, to "understand and appreciate, marvel at, enjoy even, the wonder and accomplishments of science at a level that isn't too technical or demanding, but isn't entirely superficial either". This is popular science in the true meaning of the phrase and repays diligent reading.