Book excerpt: A fun and engaging picture book from author Julia Sooy and illustrator Molly Walsh explaining Einstein's theory of relativity. Size, speed, weight, direction, distance We think of space and time as fixed and measurable. But these measurements—our experience of space and time—they are relative. Our world is relative. With simple, engaging text and vibrant art imbued with light and movement, Our World Is Relative offers a child's-eye view of time, space, and the vast role that relativity plays in comprehending our world. It's an introduction to Albert Einstein's theory of relativity, perfect for any curious young scientist. Longlisted for the American Association for the Advancement of Science/ Subaru Children's Science Picture Book Award