A study by the Lawrence Livermore National Laboratory suggests that bacteria can ingest some of the most dangerous radioactive waste and provide a mechanism to spread it.
Highly concentrated radio-active material like the waste from nuclear power is a man made phenomonen and it is truly frightening that we could create the conditions for bacteria that feed on it to multiply and spread it.
Surely more needs to be known about this before we rush to build new reactors justified by the urgent need to reduce carbon emissions.