The December 2005 issue of Scientific American has an article describing the use of liquid sodium cooled fission, which allows neutrons to remain energetic - fast. www.sciam.com/article.cfm?id=smarter-use-of-nuclear-wa Benefits cited include: - 95%, rather than 5%, energy extraction from uranium - much smaller amounts of nuclear waste - much shorter half-life of waste If this is even partly true, why isn't this being widely noted in the alternative energy debate?