Part one. Cartesian Diver are a fun and simple experiment that is easy to do for any age. The basic experiment starts with using a soda bottle and divers made out of droppers, straws or other materials. This video take a look of suggestions to make the demonstration a bit more interesting. Spinning divers, remote control divers, how many divers can fit into a bottle at once. Continue on to part two takes a look at making larger divers.