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What do science-fiction/science-history meganovel writer Neal Stephenson and Internet crank Nick Carr have in common? They both postulate that our society's glut of video and network access trains people not to sit down and learn how to think for themselves — why figure anything out if you can just Google up an answer? (Case in point: The stock-research guy who Googled a 2002 story about United's bankruptcy and wrote it up as if it were news.) Stephenson's Anathem, which takes place in a world where grownups actually do math, is available in bookstores Tuesday. You can read my Wall Street Journal review, or — heh — just watch this video.Click to viewI didn't know they make trailers for books now. "The World of Anathem" is by Seattle videographer Brady Hall, who I'm told makes a decent living from the genre.