How many legs does an octopus have? How much water should you drink every day? What is the chance of tossing a coin and it landing on heads? What is house dust mostly made from? What colour are oranges? Who in the world is most likely to kill you? What was the first dishwasher built to do? A wonderful collection of the most outrageous, fascinating and mind-bending facts. And whatever your answers to the questions above, you can be sure that everything you think you know is wrong.