http://www.aljazeera.com/programmes/whatkilledarafat/2012/07/20127383653774794.html Apparently, Arafats personal items like tooth brush and underwear are radioactive. The substance appear to be polonium 210, which is not naturally occurring, but rather, requires a reactor to produce. This reminds quiet a bit about the Litvinenko case. But why some people use such an exotic substance is odd to me... Surely, the fact that u need a reactor to produce it narrows down the list of suspect quiet a bit. Not everyone has access to that... What do you make of this?