Interesting, Bill Gates recently had an interview where he talks about new reactor designs, including the traveling wave reactor (commercialized in a prototype phase by a company he founded - TerraPower): <a href="https://www.youtube.com/watch?v=d1EB1zsxW0k" rel="nofollow">https://www.youtube.com/watch?v=d1EB1zsxW0k</a>