When is a tulip not a flower? When it's one of hundreds of mnemonic devices in this comprehensive sourcebook. From remembering the notes on a scale, to correctly performing geometric equations, mnemonic devices have helped countless students, teachers and trivia buffs recall key information quickly. In this comprehensive guide, readers will find a wide spectrum of ingeniously simple mnemonic devices for recalling facts about science, maths, geography, law, literature, world history, zodiac and much much more.