Scryer writes "Construction of the Ice Cube Neutrino Observatory was completed on 18 Dec at the South Pole. It's now the world's largest neutrino detector, with 5,160 optical sensors on 86 strings embedded two kilometers below the National Science Foundation's Amundsen-Scott South Pole Station. It has been gathering data since construction started, and will be fully operational after the last strings freeze in March 2011."
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