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Third-grade boys don’t want to be cowboys anymore. That whole astronaut thing leaves them fairly fidgety, as well. These days, if you ask your basic 7-year-old lad what he wants to be when he grows up, he will tell you—after cramming 14 school-lunch fish sticks into his head—”Ninnah!” “What?” “Ninja. I want to be a ninja.” “Ninja? I’m thinking that doesn’t pay too well.” “So? You’re stupid.” And with that, the 7-year-old, covered in cod, will kick you hard with his Nike, then wrap his chubby arm around your neck so as to playfully cut off oxygen. But I like to encourage the leaders of tomorrow no matter what their diverse aggressions might be. So I suggest they annoy their parents into taking them to see “Kagaku Engei Explore the Ninja of Feudal Japan,” where street performers from Nagoya City Science Museum will reveal all the stealthy moves of those nimble assassins. Because it’s never too early to learn how to eviscerate someone with your thumb. Watch for throwing stars at 10 a.m. at the National Museum of Natural History, 10th and Constitution Avenue NW. Free. (202) 357-2700. (Sean Daly)