Firecracker Gun

 In the summer of '53 I remember the thrill of firing off a firecracker gun that I had made from 3 feet of 3/4" black pipe with a pipe cap screwed onto the end that I had threaded. I inserted a marble and a large firecracker in the breach with the fuse going through a hole dirilled in the cap. We fired it at a half inch sheet of plywood from twenty feet, and were amazed when it tore through the plywood and hit a garage a block away. It would be more difficult to repeat that science experiment today.