News roundup: IRS issues $5.6 billion in bogus education credits, watchdog group says … Oil hits 2015 highs as Libya output slows, Saudis raise prices … Googling on mobile devices surpasses PCs in US for final time

    Upon further review: The Internal Revenue Service issued $5.6 billion in potentially bogus education tax credits in a single year, or more than a quarter of all education credits claimed by taxpayers,…

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