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A Cartesian diver is a classic experiment that explores the properties of air. Squidy kits promote hands-on learning and stimulate scientific inquiry. Squeeze the plastic soda bottle and watch the squid-like creature sink and swim in the water. Super Diver Kits promote hands-on learning and stimulate scientific inquiry. Contains enough materials to make thirty Cartesian divers. Make Cartesian sinkers, retrievers, helicopters, sealed divers, and many more. Includes Steve Spangler s Soda Bottle Science book. Counting is a kit of five divers which ascend and descend in numerical order. The kit includes a special pump.