Tim Harford’s new book, How to Make the World Add Up: Ten Rules for Thinking Differently About Numbers, has just been published. Tim’s brilliant work presenting Radio 4’s ‘More or Less’, which takes a close look at the truth behind statistics, has attracted lots of praise and his new book has been the talking point on ITV’s This Morning, 5Live, Jeremy Vine on Radio 2 and the World Service. He also written an article about it in the FT.