Why Is Violence Flaring Up in Mineral-Rich Congo?

Rebels backed by Rwanda are seizing huge tracts of the Democratic Republic of Congo. The rebels, known as M23, say they are protecting ethnic Tutsis, the minority group massacred in a 1994 genocide. But experts say the real reason is Congo’s rare minerals, which power our phones and devices. Ruth Maclean, New York Times West Africa bureau chief, explains how the rebels and their patrons in Rwanda are profiting from the conflict.