Albert Einstein began to seek a union of physical theories in a single set of equations. He wanted a theory of general unification, or a Theory of Everything, which at the time meant uniting relativity with electromagnetism. With the discovery of the forces acting inside the atom and quantum theory, the search for the Theory of Everything became even more complicated, but several scientists continued to pursue it.

When it emerged, Superstring Theory was considered for some time to be the fundamental theory of the universe. But for it to be able to explain all the components of nature in a single theory, it was necessary to consider that the universe had ten or 11 dimensions, that is, six or seven more dimensions than we can experience in our space-time. And where would these dimensions be? According to the scientists, we don't notice them because they are wrapped up in themselves, like very small tubes.