Why does Krang need scientists?

[Yabuturtle]

I always found it weird that he tried to get rid of Baxter but sometimes he sought out inventions made by other scientists or look for scientists to have work for him like in Attack of The Neutrinos.

But why is that? Krang is already world's above any scientist, including Shredder. A lot of the inventions he'd sought out is something that he could make if he's smart enough to design a mobile fortress with a force field that can shrug off army artillery, trans dimensional portals, and cyborgs as well as chemicals to make mutants. I just find it strange that he'd need anyone's help or try to find inventions he could easily make himself since he's much smarter than any human.