As a young boy in medieval Italy, Leonardo Fibonacci thought about numbers day and night. He was such a daydreamer that people called him a blockhead.
When Leonardo grew up and traveled the world, he was inspired by the numbers used in different countries. Then he realized that many things in nature, from the number of petals on a flower to the spiral of a nautilus shell, seem to follow a certain pattern. The boy who was once teased for being a blockhead had discovered what came to be known as the Fibonacci Sequence!
Blockhead is a 2011 Bank Street - Best Children's Book of the Year.
Joseph D'Agnese is a writer and journalist who lives in the mountains of Western North Carolina. Though he writes about the Middle Ages, he considers himself a Renaissance man.
John O'Brien is a frequent contributor to The New Yorker and has illustrated many popular children's books, including Did Dinosaurs Eat Pizza and This is Baseball.