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.
Pa, pokazalo se da su Einstein i Kaluza i mnogi drugi pokušavali usavršiti ovaj idejni okvir i primijeniti ga na fiziku svemira kako je bila shvaćena u to doba, ali to nije funkcioniralo u detaljima.