Tom Hartsfield - As the supply of fissile uranium dwindled in natural nuclear reactors in Africa, the regulated fission gradually died down and the sites cooled off. The waste products of that reaction were sealed into the ground. The leftover uranium is actually not very useful for building nuclear weapons. This natural design is at once fundamentally similar to our own reactor designs and totally different in its precise details. But its philosophical importance is very clear. We needn't fear that we are doing the unnatural by harnessing nuclear fission to produce power. Nature itself has run nuclear reactors for a thousand times longer than we have even known the secrets of their power.
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