My 8th-grade grandson, Nathan, was interested in constructing a desktop fission machine. I told him that it was not possible to construct such a machine. His reply was, “it was not possible . . . yet”. How about such ambition?
I started to explain the difference between fission and fusion. Along the way, Nathan learned that, for a given element, the ratio of neutrons to protons could be different. I give here my discussion with him about isotopes.