When Charlie brings a box of his grandpa's old coins to school, his classmates want to learn all about collecting coins and other currency. Join them as they learn how the idea of money started and the strange things people used before they invented metal coins and paper bills. Find out how coins are made, what secrets can be found on a dollar bill, and how to start your own coin collection. Meanwhile, you'll learn some fascinating facts about the history and culture of currency from countries all over the world. With this book, you'll be well on your way to being a knowledgeable numismatist. Book jacket.