Why do things move, fly, tick, or explode? These 25 entertaining experiments help budding engineers find out! Explore the science behind construction, from how zip wires move to how marble runs work, with these hands-on experiments. Using easy-to-find objects and tools, each fun project--including a lolly bridge and a 10-second marble challenge--can be constructed at home. Every boldly illustrated experiment includes a "How It Works" explanation and a difficulty rating; budding engineers who feel confident of their skills can try the harder ones. Build It! is the perfect introduction to key STEM topics, and guaranteed to keep young hands and minds busy.