The Washburn Observatory at the University of Wisconsin-Madison has been the school's scientific centerpiece since its commissioning in 1881. The same year which, coincidentally, was the last time anybody bothered to clean the optics.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/gi-aND7K40s/the-130+year+old-washburn-telescope-gets-its-first-maintenance-in-forever
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