Well, it turns out that Einstein and Kaluza and many others worked on trying to refine this framework and apply it to the physics of the universe as was understood at the time, and, in detail, it didn't work.
Эйнштэйн, Калуза, өөр олон хүмүүс энийг тодорхойлохоор, тухайн үедээ мэдэгдэж байсан огторгуйн физикт хэрэгжүүлэхээр оролдсон боловч энэ нь бүтэлгүйтсэн юм.