U.S. President Barack Obama pledged $7 billion Sunday to help combat frequent power blackouts in sub-Saharan Africa. Funds from the initiative, dubbed Power Africa, will be distributed over the next five years. Obama made the announcement during his trip to South Africa, the continent's biggest economy. "Access to electricity is fundamental to opportunity in this age. It's the light that children study by, the energy that allows an idea to be transformed into a real business. It's the lifeline for families to meet their most basic needs, and it's the connection that's needed to plug Africa into the grid of...