Pierre Omidyar looked out over Nepal’s Kathmandu Valley this past February, scanning the horizon with his camera in hand. All the billionaire eBay founder could see for miles were huge, belching chimneys taller than houses and mountains of red bricks drying in the winter sun. Kids of 12 or 13 lugged bricks on their backs to and from these ovens, 80 pounds at a time. Ninety percent of the workers here in Bhaktapur, the heart of Nepal’s brick sector, are slaves. Day after day they incur more debt to the traffickers who found them these jobs and hovels to live in nearby.