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Science 24 March 2006:
Vol. 311. no. 5768, p. 1693
DOI: 10.1126/science.311.5768.1693a
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News of the Week

CONDENSED-MATTER PHYSICS:
Free-Flowing Supersolid Confirmed, But Origins Remain Murky

Adrian Cho

BALTIMORE, MARYLAND--Since it was first reported that solid helium could flow without resistance, like a liquid devoid of viscosity, three other groups have reproduced the bizarre effect. But data presented here last week at an American Physical Society meeting also suggest that the "supersolid" flow occurs only in crystals riddled with defects. (Read more.)

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