My son is a younger student. He decided here to include him in the exact sciences, he stunned all kinds of chemical experiments, including "exploding paper." The essence is to mix the solution of iodine with nasopharyngeal, wait for precipitation to fall, and then filter through a wet blender. If the formed crystals are wrapped in paper and slightly ticked with a hammer - such a boom will be decent. My son is excited!
After the experience, there are a few more crystals.
I seem to know a way to punish a neighbor on a zipper who parks on the lawn.