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Fluid Particles Irreversible in Some Circumstances, Physicists Report in Nature When a viscous fluid, such as a jar of honey, is stirred and then unstirred, the contents return to their starting points. However, according to research by a team of physicists headed by New York University`s David Pine, the particles of such fluids do not always return to their original locations. The findings are reported in the latest issue of the journal Nature.
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