Penny Worms has 30 years' experience writing, editing, and producing children's books. She has written many noteworthy nonfiction and activity books, including Wallace & Gromit's World of Invention (HarperCollins Children's Books, 2010) in association with Aardman and the BBC, Wallace & Gromit's Grand Adventures & Glorious Inventions (Carlton Books, 2008), A History of the World with Google Earth (Carlton Books, 2012), a number of books in Carlton Books' hugely successful Creativity Book series, and a series of math books for Arcturus Publishing. In 2019, she founded the independent publishing company Mama Makes Books. The Most Important Animal of All was one of their first books-a Books for Topics' Best Books of 2021 for best curriculum support for children aged 5 to 7. Hannah Bailey is a talented illustrator who has established a reputation for nonfiction picture books. When the Whales Walked (Words & Pictures, 2018) won the SLA Children's Choice Award for children aged 7 to 12 and was an Outstanding Science Trade Book for Students in the United States. More recently, Sky Gazing: A Guide to the Moon, Sun, Planets, Stars, Eclipses, and Constellations (Storey Publishing, 2020), written by Meg Thacher, won the Best Hands-On Science Book category at the AAAS/Subaru SB&F Prize for Excellence in Science Books.