Cora Lee is a scientific writer for the pharmaceutical and biotechnology industry and also coordinates the Vancouver chapter of the Canadian Association for Girls in Science. She lives in Vancouver, BC, Canada. Gillian O'Reilly is a writer and editor from Toronto, ON. She and Cora Lee also co-authored The Great Motion Mission: A Surprising Story of Physics in Everyday Life. She lives in Toronto, ON, Canada. Artist Lil Crump brings the pages to life with her lively cartoons, while photographs illustrate key concepts. The dynamic layout invites even math-phobic readers to dive in. She lives in Canada.