Kirsten W. Larson used to work with rocket scientists at NASA. Now she writes books for curious kids. She is the author of Wood, Wire, Wings: Emma Lilian Todd Invents an Airplane (Calkins Creek) and A True Wonder: The Comic Book Hero Who Changed Everything (Clarion Books), along with several forthcoming titles. She lives near Los Angeles, California, with her family. Find her online at kirsten-w-larson.com and social media @kirstenwlarson. Katherine Royis the award-winning author and illustrator of many science-based books for kids, including her Sibert Honor book Neighborhood Sharks: Hunting with the Great Whites of California's Farallon Islands and How to Be an Elephant: Growing Up in the African Wild . She is also the illustrator of Otis and Will Discover the Deep: The Record-Setting Dive of the Bathysphere and of Red Rover: Curiosity on Mars . She lives with her husband and sons in Oregon, where she loves gazing up at the stars. You can visit her online at www.katherineroy.com .