THE CADILLAC WORLD THORIUM FUEL CONCEPT. “Here’s another one from the world of unlimited conceptual design: the Cadillac World Thorium Fuel concept. Otherwise known as the Cadillac WTF. Created by Loren Kulesus, everything about the WTF has been created to last 100 years without maintenance. That’s the reason for the element number ninety, thorium: to act as a nuclear fuel powering batteries that would power the car.” Yeah, this is from a while back, but I’d missed it.