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Science  29 Aug 2003:
Vol. 301, Issue 5637, pp. 1169-1171
DOI: 10.1126/science.301.5637.1169a

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Summary

Physicists have hoped that a flaw in Einstein's special theory of relativity might reveal that space and time aren't smooth at the smallest scale, but fuzzy and foaming. Now, two independent measurements of cosmic gamma rays show that Einstein was right after all--and that current plans to detect the foam are doomed.