Jarmel said:
Yes I'm aware about the nuclear fusion but the fact that they understood that means they have more than a basic understanding of atomic physics.
Oh, well, I certainly don't think that there's anything too weird about two really intelligent beings, both shaping nations, and both with the ability to control matter at the molecular level would not guess about the existence of nuclear fusion sometime, given a few hundred years to tinker about.
Heck, I wouldn't be surprised if it was present in the scientific community either. Theories often precede technology by decades, as did fusion in reality, and they don't exactly have a low level of technology in FMA (past a curious lack of airplanes).
Advent does sound cooler than Father, of course :v