First of all, our approach is not very small, but I'll be happy to talk about the proliferation advantages and safety advantages.
Proliferation advantage comes mainly from the fact that the fuel is left inside the reactor for some length of time. The proliferation advantage comes because eventually the reactor system can sustain itself without the need for enrichment plants. In Iran and other places, you know that's a problem. Because depleted uranium and natural uranium can be used as the fuel and used much more efficiently than previous reactors, you don't need to take the waste and separate out plutonium, make a new fuel and put it back in; therefore, one has eliminated the proliferation risk of reprocessing, as it's called.
Finally, you can take this reduced amount of waste that the reactor produces and put it directly in the ground. Some folks at MIT and Berkeley are advocating the use of the bore hole, which means you immediately dispose of the waste. So the infrastructure is so simplified and the number of times you have to refuel so reduced, the approach to proliferation is much more attractive.
When it comes to safety, the reactor operates at higher temperatures. This is not our idea; it's been put forward before. If you have a reactor that operates at these higher temperatures and something goes wrong, clever engineers can arrange a chimney effect basically that allows this coolant, which is very good at conducting heat, to dispose of that heat à la the chimney effect to an infinite heat sink, namely the atmosphere. You can screw up the operations, the operator can do the wrong thing or not, a wave can come and shut down diesels, but this thing will stay cool enough to be fine.