Of course it makes sense. Humans will always be coming up with new things. I think the context of those things just depend on what their world already looks like or needs. I've heard people talk about guns, but... they'd be useless against metalbenders in my world, so I don't know if they'd ever really gain traction, even if I can see where the idea might happen.

( he shrugs a bit. then, )

What's 'Zentradi'?