In this excerpt from his acclaimed book, The Elegant Universe, Brian Greene explains why string theory might hold the key to unifying the four forces of nature.

What is the stuff in the universe made of? Our high-school physics tells us atoms, with 90 natural elements building the world around us. But what are these atoms made of? Over the last century ...

Researchers are using machine learning, symbolic regression, and high-performance computing to explore and classify string ...

Five's company. The five different string theories had a few commonalities. For one, they all involved strings. They also all required our universe to have 10 total dimensions: the usual three ...

Telegenic string theorist Brian Greene talks about his life, the universe and the theory of everything in an extended Q&A with MSNBC.com.

Or not. A new understanding inspired by string theory shows that our universe may be more stable than we previously thought.. A broken universe . Within the first microseconds of the Big Bang, the ...

Airs Wednesday, July 18, 2012 at 10 p.m. on KPBS TV. In the second hour of “The Elegant Universe,” delve into the nuts, bolts, and outright nuttiness of string theory.

The problem with string theory, according to some physicists, is that it makes too many universes. It predicts not one but some 10 500 versions of spacetime, each with their own laws of physics ...