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! Minerals; Crystals; Fossils. Grow a salt rock garden, rock candy, and string crystals; identify five unknown minerals using the streak, hardness, magnetic, and acid tests; make a cast and mold a fossil, and more!