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When a spy told us she spotted Mary-Kate Olsen hanging out at Urth Cafe a couple of days ago, it struck us as a bit odd. A single Olsen sighting? Whither Ashley? And shouldn't MK be hitting the books back at NYU? Unfortunately, it seems as if higher education has failed Mary-Kate, or, perhaps, Mary-Kate has found the academic life to be disagreeable. Her rep says she's missing "very few classes" while taking care of "personal business" in L.A., but sources close to the Rehab Twin say she might never go back. If Mary-Kate is simply too homesick to hang out at NYU, we're sure the school has a variety of outpatient independent study options that would allow her to stick with her studies. Despite what she might have heard at Cirque Lodge, no one likes a quitter.