Science and fun go together like… well, like things that don’t often go together at all. So it’s no mean feat to find that Brian Clegg has managed to combine the two so skilfully in How Many Moons Does the Earth Have . The book is in the format of a pair of pub quizzes, but unless you’re drinking in a pub favoured by geeky academics in either Oxford or Cambridge (I would have just said Oxford, except that Brian went to the other place!) I would say that 99.99% of readers (I can say that confidently as no one can check it) will just read the book through like I did, to entertain and test themselves. Each question is cleverly laid out, in that each is posed in the form of a puzzle, problem or brainteaser, augmented with a few related ‘while you wait’ fun facts on a single page; giving the reader the space to test themselves. Once done, the reader then turns the page to find the answer - complete with a detailed explanation. This makes each question an interesting standal