What could be more fun?
“The Gauss Rifle: A Magnetic Linear Accelerator
“This very simple toy uses a magnetic chain reaction to launch a steel marble at a target at high speed. The toy is very simple to build, going together in minutes, and is very simple to understand and explain, and yet fascinating to watch and to use.”
Steve Cooper's Personal Blog 
2 responses to “Build your own Gauss Rifle.”
Fun stuff. There’s a railgun in the electromagnetism section too.
I fully intend to be using these in my teaching career. What could be more educational than learning how to be weapons designers of the future?