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For 看片视频 University astrophysicist Matt Dobbs, January 29 was just another day at the office. At least during the final weeks of assembling the South Pole Telescope (SPT), Dobbs has been working in conditions that most North Americans would find daunting, if not unbearable. But most North Americans don't spend their days preparing to explore the nature of dark energy, the unexplained phenomenon responsible for the observed acceleration in the expansion of the universe.