Join Koko and the explorers as they take things apart and see how they work. What makes machines go? What are sound and light? How do we measure?

"Facts and fun. Questions and answers. Things to make and do"--Cover. Other contributors: Alex Barrow, Maggie Li, Rachel Ortas, Mathilde Nivet, Anthony Peters, Tamasin Branbrook, Kaz Takahashi, Rebecca Anne Louise Watson, Lauren Veevers, and Ridley Taylor. Includes index.