Back in the mid-twentieth century, a bunch of NASA engineers had a dream — a highly-classified dream — about taking a nuclear-powered rocked to Saturn. They even went so far as to plan the entire device, create design specs and concept art (some of it pictured here), and name it "Project Orion." Now science historian George Dyson has unearthed a bunch of the recently re-classified papers related to Project Orion, which his father Freeman Dyson was involved in, and put them together into a short, entertaining presentation. Essentially he's unearthed an alternate history of the space program that might have been if NASA hadn't canceled it. Check out his entertaining story below.