presented his recent accomplishment on building small underground nuclear fission reactors that are self-contained and use decommissioned nuclear weapons to fuel power. [6] He temporarily left his research on the fusion reactor, and developed the compact molten salt reactor that he says needs refueling only once every 30 years. According to Wilson, because much of the reactor is buried and its uranium is not weapons-grade, it’s less vulnerable either to terrorist attack or misuse. [7]