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This winter, when Mary Liu sits down to take the final exam in an online course on epidemiology and biostatistics, she’ll do so from the comfort of her own home. She’ll have 24 hours to complete the test, which accounts for 60% of the final grade in the online course, but no one will be peering over her shoulder to make sure she completes the exam on her own without the aid of any of her 50,000 classmates or Wikipedia.
