David A. Adler is a former math teacher and author of more than two hundred books for children. He has collaborated on several science picture books with Anna Raff, including Light Waves and Magnets Push, Magnets Pull, both named finalists for the AAAS/Subaru SB&F Prize for Excellence in Science Books. He is also the author of the Picture Book Biography series and the Cam Jansen mystery series. He lives in New York. Anna Raff is an acclaimed illustrator of children's books. She illustrated David A. Adler's Simple Machines and Things That Float and Things That Don't, which received starred reviews from both Booklist and Publishers Weekly. She lives in New York City.
Using very simple terms and aided by Raff's whimsical illustrations, Adler introduces young readers to the concepts of gravity, mass, weight, inertia, and resistance. Everyday examples and objects are used to illustrate the principles, such as a ball rolling off a table or marbles falling through water. Each of these examples or activities could easily be replicated by readers at home or in the classroom. -School Library Connection