How much do clouds weigh? Who invented the pencil? How many ways can you tie a knot? Discover the answer to these and many other questions in this elegant and absorbing miscellany of general knowledge. From music notation to Roman numerals and from the skeleton to the solar system, essential facts are brought to life by stylish infographics and fascinating commentary. With pictures by effortlessly stylish print-maker James Brown and fact-filled explanations by celebrated author Richard Platt, there is a world of information at your fingertips in this book – sure to amuse and intrigue even the most curious minds.