Along with Caltech physicist Mlodinow (The Drunkard's Walk), University of Cambridge cosmologist Hawking (A Brief History of Time) deftly mixes cutting-edge physics to answer three key questions-- Why is there something rather than nothing? Why do we exist? Why this particular set of laws and not some other?-- and explains that scientists are approaching what is called "M-theory," a collection of overlapping theories (including string theory) that...

Physicist Brian Greene discusses the historical quest for a grand unified theory in physics which will reconcile quantum physics and general relativity, and considers the possibility that superstring theory may bring an end to that search.

An exploration of the theory of hyperspace by a professor of theoretical physics discusses the superstring theory and the concept of a jigsaw-puzzle universe.