I have been reading a lot about nuclear plants and how when things go wrong the whole area becomes inhabitable. I have been trying to understand certain things but i am not sure. I hope my understanding of it are not filled with self-inflicted misconceptions. 1) Uranium crystals found in nature in general are only slightly radioactive. Does it mean that the uranium radiation is usually not high enough to cause health problems? 2) Is it true that what's actually highly radioactive are the resulting elements uranium's nuclear fission; not uranium itself? 3) Is it true that the radiation of the unstable elements doesn't spread themselves very far? Is it the coolant liquid/gas' spills from the reactor; that carry the radioactive particles far from the source? 4) When people check sites years after radioactive spills have happened, they find that the nearby vegetation and/or objects have become radioactive as well. Does it mean that by leaving a highly radioactive element next to a stable element, the stable element becomes radioactive with time too? 5) Are there chemical reactions to make unstable isotopes of elements to become stable? 6) Isn't there any convert the radioactivity of radioactive wastes into electricity? And therefore at the same time accelerating the process of radioactive decay?