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Optical rotation sheds light on vacuum Physicists in Italy have demonstrated that empty space can cause light to rotate in the presence of a large magnetic field. Although the effect seen by Emilio Zavattini and co-workers on the PVLAS experiment at the INFN laboratory in Legnaro is extremely small, it could provide evidence for exotic new "dark matter" particles called axions (Phys. Rev. Lett. 96 110406).
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