Physicists at the Large Hadron Collider at CERN, Europe's particle-physics laboratory near Geneva, Switzerland, say that they have achieved the hottest man-made temperatures ever, by colliding lead ions to create a quark-gluon plasma. Presenting data on 13 August at the Quark Matter 2012 meeting in Washington DC, researchers on the ALICE heavy-ion experiment said that they had created a plasma 38% hotter than the record 4-trilliondegree-Celsius plasma achieved in 2010 by a similar experiment at Brookhaven National Laboratory in New York.
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