Richard Wurman

Dan Eldridge is a journalist and guidebook author based in Philadelphia's historic Old City district, where he and his partner own and operate Kaya Aerial Yoga, the city's only aerial yoga studio. A longtime cultural reporter, Eldridge also writes about small business and entrepreneurship, travel, and the publishing industry. Follow him on Twitter at @YoungPioneers.

Scores of our generation's most celebrated authors have famously waxed poetic about the joys of using the original 20-volume "Oxford English Dictionary." David Foster Wallace, for instance, had a well-documented obsession with the OED. Simon Winchester wrote not one, but two nonfiction books about the dictionary's history. Even J.R.R. Tolkien, who briefly worked on the OED (he was assigned to the letter "W"), spoke fondly of his time there.

But the simple fact is this: When I need to know the correct spelling of, say, "onomatopoeia," or "conscientious" or "hierarchy," there's a decent chance I'll be heading straight to

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