Here’s the basic plot line. Laptops, smart phones, tablets—they all need the rare minerals that Congo has in abundance. And that means that our gadgets are helping to fuel child labor—and rape—on a colossal scale. It’s a long journey from here to there, and it’s complicated. But lawmakers in the U.S. want to leverage our consumer power to bring change to the Congo. The question is: Do they stand a chance of making a difference?