Wednesday, July 04, 2007

You Can't Travel Back in Time, Scientists Say

from Live Science online

While the idea makes for great fiction, some scientists now say traveling to the past is impossible. There are a handful of scenarios that theorists have suggested for how one might travel to the past, said Brian Greene, author of the bestseller, "The Elegant Universe" and a physicist at Columbia University. "And almost all of them, if you look at them closely, brush up right at the edge of physics as we understand it. Most of us think that almost all of them can be ruled out."

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