Joan Holub has hundreds of pencils. Some are red. Others are glittery, sporty or full of holiday cheer. They are all super sharp and good at writing books. They've helped Joan write over 130 books, including Zero The Hero (with Tom Lichtenheld) and Knuckleheads. Luckily, her pencils can stand on their heads because she does lots of erasing along the way! Melissa Sweet has illustrated more than thirty children's books, including the Caldecott Honor-winning River of Words and the Sibert Medal-winning Balloons Over Broadway.