Calutza Line Theory - What Is It?

There is a fourth space spatial dimension, but it is so small and so curled up that we don't observe it with the senses that we possess. If such a fifth dimension exists, then it is tis the effect of gravity in this dimension that will generate what we what we feel as electromagnetism. That is kalutza line theory. It remained like a mathematical curiosity, oddity artifact for the longest time. And then string theory appeared, 19 sixties onward. They took calutzalin, the calutza cline idea, and they extended it. The thing about string theory is that the theory itself predicts how many dimensions of spacetime should exist. So that