to dealing with five or higher dimensions. Yet we should point out that the fourth dimension was controversial for a number of years after Minkowski first identified it as time. Even Einstein needed to be convinced. Eventually, he and others came to accept the four-dimensional nature of space-time.

Just as the fourth dimension provided a natural way of describing time, introducing the fifth dimension can do the same for mass. It provides a natural way of resolving one of the fundamental mysteries: How did all the mass in the universe arise?