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Like every other kid who grew up in this area, I endured annual field trips to the National Air and Space Museum. These loosely structured forays into the world of flight usually dissolved into freeze-dried “astronaut” ice cream feasts followed by motion sickness and vomiting in the IMAX theater. As we matured, the Albert Einstein Planetarium fulfilled the ever-pressing adolescent need to spend time in a dark, unchaperoned area. (A stiff neck was a small price to pay for a smooch beneath the aurora borealis—sigh.) Today, the museum celebrates its 25th anniversary with a free showing of To Fly (at 9:30 a.m.), Lindy Hop lessons, scientific demonstrations, and birthday cake. Though the planetarium will maintain normal hours (bring the one you love), the rest of the museum will open an hour early. The festivities run from 9 a.m. to 5:30 p.m. at the National Air and Space Museum, 6th and Independence Avenue SW. Free. (202) 357-2627. (Sarah Godfrey)