On our season 4 finale, “In Orbit” is going nuclear — in a good way! Experts agree that to achieve the sustainable energy system of the future, nuclear power is an absolute must-have. In this episode, we’re joined by Scott Davis, advanced nuclear fission and fusion consultant with Frazer-Nash Consultancy, a company in the KBR family. Scott explains how different kinds of nuclear reactions work, why nuclear energy isn’t scary, and the challenges and opportunities specifically on the horizon for nuclear fusion.