Make a hollow cylinder massing about 5 Kg of U235 or Pu239 (gotta be 99% pure). Make a plug massing about the same of the same stuff, machining it so that it fits smoothly and snugly inside the cylinder. Surround the cylinder with Li(VI) Deutride.

Now, boys and girls, you're ready to conduct your first experiment in fusion reactions!

First, tell all your little friends goodbye. Then shove that ol' plug into the cylinder just as fast as you can.

Write a report on this for the science fair....