Like what I make? Want fewer sponsorship ad reads? Consider contributing to my Patreon at https://patreon.com/OurOwnDevices To celebrate the channel's 1-year anniversary, I cover a subject many of you have been asking for: unusual nuclear reactor designs. In Part I, we look at the history of fast breeder reactors, which held a great promise in the 1950s but due to various technical, economic, and political factors were largely superseded by more conventional PWR and BWR designs.