From Plus, Marianne Freiberger on understanding uncertainty and evolutionary maths and quantum geometry; Chris Sangwin on arithmetic, bones and counting; Caroline Series and David Wright on non-Euclidean geometry and Indra's pearls; a review of Nonplussed! Mathematical proof of implausible ideas by Julian Havil; a review of The Art of Mathematics: Coffee time in Memphis by Bela Bollobas; a review of Mathematics and Common Sense: A Case of Creative Tension by Philip J. Davis; and a review of A Beautiful Math: John Nash, Game Theory, and the Modern Quest for a Code of Nature by Tom Siegfried.

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