I used to know that

"Nostalgic, informative and entertaining, it is an ideal and accessible buy for adults wanting to brush up on their lost knowledge. If you've forgotten the capital city of Chile; the basics of osmosis; how to solve a quadratic equation; who wrote the famous poem about daffodils; and, the use of a conjunction or the number of continents in the world, "I Used to Know That" is guaranteed to provide all the answers"--Publisher's description.