Simon Basher is the creator and illustrator of more than a dozen internationally bestselling books for children, with sales reaching over three million copies. His critically acclaimed Basher Science series includes the perennially popular booksThe Compete Periodic Table and Engineering. Basher's A to Z of Science (published January 219) is an essential go-to reference source for all school students, and a handy revision guide for college students too. Jonathan O'Callaghan is an accomplished freelance science and technology writer with the special ability to break down complex topics for readers of all ages. He has written for Scientific American, Forbes, Horizon, BBC Earth, All About History, and World of Animals. Jonathan studied Physics and Astrophysics at the University of Birmingham in the UK.