Coursera founders Andrew Ng and Daphne Koller are computer science professors at Stanford University. Jeff Chiu/AP hide caption

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Lorie Miller affixes a QR code to her grandparents' gravestone. Miller and her husband are launching a business that will supply QR tags and maintain a website featuring the deceased. Emma Lee/Newsworks hide caption

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Ever feel like someone is watching you? The Federal Trade Commission finds you could be right — if you've used a rental computer. iStockphoto hide caption

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A spoof site launched by Erik Johnson pretends to offer Google's search engine — if it were run by replacements. Replacement Google hide caption

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Alice Beauheim, her father and Bill Love fly their homemade machines at the Drone Smackdown in Manassas, Va., on Sunday. Objections by the Federal Aviation Administration forced organizers to hold the tongue-in-cheek contest outside of Washington, D.C. John Procter hide caption

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The Physics, with Thig Nat at the right. Courtesy of the artists hide caption

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