Hi, I am not sure if this sort of thing should go here but I have a suggestion for a new particle/element.
Well I think that the Powder Toy team could create NANOBOTS they would behave sort of like acid - eating other elements however everytime that they eat a particle they will also multiply. (A bit like in the movie The Day Earth Stood Still) They would be killed by extreme heat and EMP.
NANOBOTS would sort of go into electronics section.