With a funnel, string and super bubble solution, you can create a bubble that can be pierced with a pencil. Designed with instructions for classroom use, this site contains a couple of bubble experiments. That's what these folks at the University of Pittsburgh are doing. Actually, they are studying fluid dynamics using soap film. Well, a bubble is a film, but a film is not a bubble.
Bubbles usually start as a film, for instance in a bubble wand.
For high school science students, and other serious science fans, this site goes far beyond what is covered in the other sites. Legend has it that the first soap made was an accident. In ancient times people used to sacrifice animals in fear of their Gods. The fat from these sacrificed animals soaked into the ashes of the fire and then flowed into a nearby river. When the women went to wash their clothes in the river they noticed that their clothes were cleaner than usual.