How much do clouds weigh? Who invented the pencil? How many ways can you tie a knot? Discover the answers 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. Perfect for all ages, this book is sure to amuse and intrigue even the most curious minds.