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.
"Gravity is clearly and simply explained in this book
featuring both animals-mice, dogs-and humans, who are diversely
represented. . . . An excellent nonfiction resource for all
libraries, this comes highly recommended."-School Library Journal,
Starred Review
"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
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