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A dozen teenagers in military fatigues sit quietly fiddling with small devices in antistatic bags, waiting, like the other kids around them, for further instruction. A teacher murmurs a few sentences of introduction to the activity from the front of the room. It’s the last session in the Oracle Code 4 Kids one-day conference in San Francisco, and it doesn’t seem promising. A short time later, that first impression proves very wrong. The teens, who are from Discovery ChalleNGe Academy, an...