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Science 23 October 1998:
Vol. 282. no. 5389, pp. 602 - 603
DOI: 10.1126/science.282.5389.602
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News of the Week

PHYSICS:
Particle Decays Reveal Arrow of Time

David Kestenbaum

The microscopic level where particles collide and decay has seemed indifferent to the direction of time. But two groups of researchers have now directly detected the forward march of time in the decays of subatomic particles by measuring the rate of a particular decay and showing that it differs from the rate of the same process done in reverse.

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