Clear, clever and friendly -- Alex Bellos A spirited and friendly guide - appealingly down to earth about math that's extremely far out -- Jordan Ellenberg, author of How Not to Be Wrong Witty, charming, and crystal clear. A brilliant book! -- Ian Stewart, author of Calculating the Cosmos An individual journey into numbers from an absolutely fresh perspective * Royal Society Prize judges citation * Mesmerising ... Cheng's argument about how our minds are stretched in the effort to conceive infinity is ultimate proof that it's the journey, not the destination, which counts * Big Issue * It takes a talented writer to bring the concept of infinity to life, but Cheng's infectious enthusiasm makes maths a delight * BBC Science Focus *