Have you ever wondered how to: • Weigh your own head? • Tell if a martini has been shaken, not stirred? • Extract the iron from breakfast cereal? • Make eggs go green? • Measure the speed of light with chocolate and a microwave? This brilliantly wide-ranging collection of do-it-yourself experiments from Mick O’Hare and *New Scientist* magazine – designed to be done at home or nearby, using everyday household items – effortlessly displays scientific principles in action, and will amaze, inform and delight. The eagerly awaited companion to the bestselling *Does Anything Eat Wasps?* and *Why Don't Penguins' Feet Freeze?* is a dazzling mix of wit, explanation and insight into the world around us. It will bring out the scientist in everyone.