3 Complete Science Kits in Each Set! Designed by a team of Harvard graduates, scientists, educators, and parents, these award-winning kits are packed with exciting hands-on experiments. Each set comes with 3 complete kits (3 manuals and 3 supply bags) that provide young scientists with hours of learning fun! Weather; Solids, Liquids, and Gases; Volcanoes. Mix solids and liquids to create gas, a bouncy ball, and goop; make a weather station with a barometer, wind vane, rain gauge, and thermometer; build a volcano and more!