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I was a klutzy kid, though you wouldn’t know it from the way I now manage to match my socks and eat without injuring myself. I almost made it into the in- crowd in fifth grade, though, when I wangled a gig as a double-Dutch turner. I never, ever jumped—I knew my limitations, and so did the cool girls—but I got to be pretty good at handling the ropes. So I was bummed to hear about “Dutch 2000,” a gizmo that renders turners obsolete. Damn those nerds at Rensselaer Polytechnic! I bet their classmates never let them jump, either. In the Smithsonian’s Lemelson Center symposium “The Playful Mind,” you can view “Dutch 2000″—or the Luddite kids of the Ebony Angels Double Dutch Team. Other displays and programs include a machine that converts synthesizer music into light patterns, the work of special-effects designer Martin Kline (Jurassic Park, Stuart Little, Contact), and “Playback Theater,” in which audience stories are converted into theater pieces. (Fifth-grade psychodrama, anyone?) From 8:30 a.m. to 5:30 p.m. at the National Museum of American History, 14th Street & Constitution Ave. NW. Free. (202) 357-2700. (Pamela Murray Winters)