It appears to be a foregone conclusion that we’ll be building more nuclear reactors over the next few decades. However, while they are considered to be ecologically sound they may run into problems of economics in the near future – uranium is a rare substance to start with, and it’s not getting any cheaper. A potential solution to this problem (and others) is the Molten Salt Reactor concept – as the name implies, it would use molten salt as a coolant for the reaction chamber, and could use the safer and more abundant element thorium as a fuel.