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At the Relativistic Heavy Ion Collider (RHIC), New York, and the Large Hadron Collider (LHC), Switzerland, heavy ions are smashed together at high speeds to study the quark-gluon plasma—the hot soup of elementary particles that existed during the Universe’s first microsecond. The strength of the magnetic field produced in these heavy-ion collisions is typically calculated using Ohm’s law of electrical conductivity. But now, Zhe Xu at Tsinghua University in China and his colleagues have shown that such a calculation can overestimate the field strength, and in turn, the magnitude of any exotic field-associated phenomena [1].

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