Most people think of mathematicians as solitary, working away in isolation. And, it's true, many of them do. But Paul Erdos never followed the usual path. At the age of four, he could ask you when you were born and then calculate the number of seconds you had been alive in his head. But he didn't learn to butter his own bread until he turned twenty. Instead, he traveled around the world, from one mathematician to the next, collaborating on an astonishing number of publications. With a simple, lyrical text and richly layered illustrations, this is a beautiful introduction to the world of math and a fascinating look at the unique character traits that made "Uncle Paul" a great man. A Kirkus Reviews Best Book of 2013 A New York Times Book Review Notable Children's Book of 2013Bank Street College of Education Cook Prize (2014) American Library Association Notable Children's Books Capitol Choices Noteworthy Titles for Children and TeensOrbis Pictus Honor BookBank Street Best Children's Book of the YearALA Notable Children's BooksNYTBR Notable Children's BOTYArizona Grand Canyon Young Readers Master

Deborah Heiligman has written numerous books for young readers, including Charles and Emma: The Darwins' Leap of Faith, a National Book Award finalist. She lives in New York City. deborahheiligman.comLeUyen Pham has illustrated dozens of books for kids, including God's Dream by Archbishop Desmond Tutu, Freckleface Strawberry by Julianne Moore, and her own Big Sister, Little Sister. leuyenpham.com