The I'm Curious About picture book series teaches young readers about the world's coolest historical figures, discoveries, and events.Michael Phelps is not only the greatest swimmer of all time, he is also the most decorated Olympian in history. He wasn't always great, though--at age seven, he couldn't even swim underwater. In this book, kids see how a little bit of encouragement helped Michael Phelps go from struggling swimmer to Olympic champion.