Another book of stories about mathematicians, showing their human side. Not quite as fascinating as the first book, but still very good.
We use it as part of our science and math reading for homeschool, and it would be a worthwhile addition to history or math studies for any teen. Although anyone 8-10 and up could read this book, a bit more knowledge of history and math makes it much more interesting, so it would appeal more to teens. I enjoyed it as well.