Doesn't some sort of chain reaction already occur with neutrons in deuterium oxide? The chain reaction is slower, but the kind of chain reaction mentioned here would happen in a flash.
and nuclear waste will created after a nuclear reaction
Yeah, and plutonium also hurts STKM so it's already a nuclear waste. :D
Not anything, bananas don't hurt people even though they are radioactive.
And becoming invisible means that you drown? OOoookaaayy..
Just because something is radioactive does not mean it is dangerous. It really depends on the specific activity level of the object. For example,you could hold a kilogram of uranium in your bare hands and not be harmed. On the other hand, if you held a kilogram of radium, you would most likely die due to the gamma rays emitted (Radium is normally an alpha particle emitter, but the radon nuclei produced in the decay process are very energetic, and will then emit a gamma ray to expel that excess energy.).
I think adding sounds would be a good idea, however it would probably be quite difficult and would require quite a bit of coding.