The Avatar??is capable of bending all four elements.????Is someone who isn't the Avatar capable of using more than one element??? Is??the??"bending" gene specific to each population so that only a child of Earth Kingdom residents can bend Earth??? Perhaps if a Fire Nation man and an Earth nation woman has a child is it possible that it could bend both??elements??? It seems we should see some people like this at some point since some interbreed must occur somewhere on the fringes.?? Lavabenders would be most interesting, Fire to make it and Earth to move it.?? This may??not work is if the gene has several different alleles (one for each type of element, one for no bending, and the "mutant"Avatar gene) thus there is no version of that gene excepting the Avatar that would grant dual-powers.?? I wonder what the Avatar's children would be like??? It could be quite interesting if he propagates with another bender since that would possibly increase the chance of a bending child, and maybe a dual-bender.