The Works Museum exploded with activity during the annual celebration of National Engineers Week on Saturday in Bloomington. At top, Caroline Fairbrother, 6, middle, and her brother Lucas, 3, did some reverse engineering on a DVD player with the help of volunteer Ted Williams, an engineer for Xcel Energy. Next, Nick Kleinjen and his wife, Jen, showed their children Lucas, 4, and Haley, 1½, and her twin, Sophia, different sensors from things like a radio, fan and telephone. Third, youngsters used homemade play dough, with a battery and motor, to show how it can conduct electricity. Bottom, small hands used a pliers to dismantle electronics gear.