If nuclear power hadn't been invented to bomb Hiroshima or power military fleets, what would our reactors look like today? What if the civil use of nuclear energy had come first from the start - as a supplier of energy and heat, with the aim of supporting wind and solar energy instead of replacing them? Then our reactors today would maybe be thorium molten salt reactors. Aalmost three quarters of a century after their invention, molten salt reactors are re-emerging. Failed with the first prototypes in the 1940s, finally abandoned in 1973, they are now being further developed by scientists. But will they prevail and revolutionize our planet's energy supply? The documentation searches for alternatives to traditional nuclear energy.