If you're a fan of our regular Outer Space column by John D Barrow, then you can now get your hands on some of it, and much more besides, in book form. In A hundred essential things you didn't know you didn't know Barrow applies his usual style and insight to anything from winning the lottery, placing bets at the races, and escaping from bears, to sports, Shakespeare, Google, game theory, drunks, divorce settlements and dodgy accounting — all obviously things that only make sense with maths. The bite-sized chapters are easy to digest and form formidable weapons in your war on ignorance.