Remember the Sears kit houses from the early 1900s, ordered from a catalog and assembled on-site? Now, online designers around the world are building WikiHouses out of plywood pieces that fit together like a puzzle. No nails, no fasteners, no adhesives. Just slot-together joints and the Internet.
As head of D.C.'s Office of Planning through the past two mayoral administrations, Harriet Tregoning has had a hands-on role over city policy. We speak with her about her tenure and what's next for her in a new job within the Obama administration.
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