• Fission Chain Reaction: This applet illustrates what happens in a nuclear chain reaction. Click anywhere in the region containing the green nuclei to add a neutron to start the reaction.
  • Energy from Fusion: A chart shows the workings of fusion as a form of energy. The Guided Tour feature on the sidebar shows how fusion compares to other energy sources, as well as the necessary considerations for creating a fusion reaction.
  • Chernnobyl Meltdown: This applet lets the user control the various valves and pumps involved in Chernobyl's plant operation. The aim is to see how long the user can control the plant without meltdown.