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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 fill in many (but not all) the blank spots in quantum physics; this collection is known as the "Grand Unified Field Theories."
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