New stable form of plutonium discovered

An international team of scientists have found a new compound of plutonium with an unexpected, pentavalent oxidation state This new phase of plutonium is solid and stable, and may be a transient phase in radioactive waste repositories. 

Radioactive waste can possibly be immobilized in glass for millions of years

How do you handle nuclear waste that will be radioactive for millions of years, keeping it from harming people and the environment? It isn't easy, but a researcher has discovered ways to immobilize such waste.