Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimension (1994, ISBN 0-19-286189-1) is a book by Michio Kaku, a theoretical physicist from the City College of New York. It focuses on Kaku's studies of higher dimensions referred to as hyperspace. The recurring theme of the book is that all four forces of the universe (the strong force, the weak force, electromagnetism, and gravity) become more coherent and their description simpler in higher dimensions.
A good history and coverage of current events. I wanted more on string theory and Ramanujan's modular functions, but at least this serves as a good pointer.
