There is. In each nation, there's people who are born with the ability to bend. Controlling the elements. In the Fire Nation, there's firebenders, for example. [Aha.] Though you can pretty much find benders and non-benders of all kinds in the world nowadays.
[Asami at least seems to understand about that sort of technology, like it's not yet so foreign.]
It's amazing, isn't it? We actually still have some of the things you mentioned in my world too, at least in some areas, but coming here is -- a whole other world of advances.