I have some very creative children. Mr. Diligence, last Saturday, was looking at an empty glue stick. After investigating it, he figured out how it worked, and thought it might be able to lift something up. He took it outside and got busy with tools and wood, and after several hours of trial and error he had come up with a jack! He was able to lift things by screwing the cap. He lifted a heavy stack of books and a few other things, but when he tried to lift the couch it broke. He rebuilt it, however, using a different glue stick he found!