Scientists Predict How to Detect a Fourth Dimension of Space: "Charles R. Keeton of Rutgers and Arlie O. Petters of Duke base their work on a recent theory called the type II Randall-Sundrum braneworld gravity model. The theory holds that the visible universe is a membrane (hence 'braneworld') embedded within a larger universe, much like a strand of filmy seaweed floating in the ocean. The 'braneworld universe' has five dimensions -- four spatial dimensions plus time -- compared with the four dimensions -- three spatial, plus time -- laid out in the General Theory of Relativity. "