You can stand on water—but only when it’s frozen. The segment Solid, Liquid, and Gas (7 min.) explains water’s different states and how it changes from ice to liquid to steam. Then Heat and Matter (6 min.) illustrates what happens when heat changes water from one state to another. Heat is also featured in Thermal and Light Energy (5 min.), which describes the spectrum of light waves that includes visible colors and invisible microwaves. Forces and Gravity (3 min.) introduces the concepts of gravity, force, inertia, and motion with visual examples of each.