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Science 23 July 2004:
Vol. 305. no. 5683, pp. 464 - 466
DOI: 10.1126/science.305.5683.464
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THEORETICAL PHYSICS:
Physics Enters the Twilight Zone

Charles Seife

Parallel universes have launched a thousand bad science-fiction plots. Now mainstream physicists and cosmologists are arguing that they are both useful and, in an infinite cosmos, inevitable.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)