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IT HASN’T been a great couple of years for theoretical physics. Books such as Lee Smolin’s The Trouble with Physics and Peter Woit’s Not Even Wrong embody the frustration felt across the field that string theory, the brightest hope for formulating a theory that would explain the universe in one beautiful equation, has been getting nowhere. It’s quite a comedown from the late 1980s and 1990s, when a grand unified theory seemed just around the corner and physicists believed they would soon, to use Stephen Hawking’s words, “know the mind of God”. Â鶹´«Ã½ even ran an article called…