On Sunday at New York’s Javits Center, hundreds of teens gathered to compete in the finals of the FIRST Robotics Competition regionals. The winners will go on to the National Competition in Atlanta—for the rest, this competition was the end of the assembly line. On the track, the competition was fierce and students eyed each others' handiwork warily. But behind the scenes in the pit, where goggle-clad kids wielded screwdrivers and tinkered with their machines, the students shared their knowledge with each other, with experienced groups often lending a hand to first-timers. The Capri-Sun flowed freely.