A light-hearted and informative reminder of all the things that we learnt in school but have since become relegated to the backs of our minds, 'I Used to Know That' features hundreds of snippets of wisdom, facts, theories, equations, phrases, rules and sayings It is a practical guide to turn to when an answer is eluding you, when helping a child with homework or preparing them for the new school year, or maybe just to brush up on trivia for the pub quiz 'I Used to Know That' covers English Language and Literature, Mathematics, Biology, Chemistry, Physics, History, Geography and General Studies, so never again will you find yourself stumped!