Founders Fund has made its first investment through FF Science, its new allocation for early-stage science ventures, putting $2 million into Transatomic Power. The Cambridge, Mass., startup is developing a nuclear reactor that it claims will be safer, cleaner and cheaper than traditional versions. The company plans to use the money to test and refine the designs. Transatomic co-founders Leslie Dewan and Mark Massie developed the technology, which reduces the amount of nuclear waste by relying on liquid rather than solid fuel, as graduate students at MIT. If you’d like the technical explanation, it’s here.