<p>An Indian barber holding a candle, has a haircut for a customer at his shop in Kolkata, India, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without government-supplied electricity for several hours in, by far, the world's biggest blackout. (AP Photo/Bikas Das)</p>

August 1, 2012