For two years after the accident, Yei Yang refused to leave his home. I couldn't farm, I couldn't go to see friends, as they might be afraid of me," Yang tells CNN. "I didn't want to live." Yang was just 22 and burning rubbish near his village in the province of Xieng Khoung in north-eastern Laos, when a bomb blast tore off one of his eyelids, his top lip and an ear, mutilated one of his arms, and left him with severe scarring from the waist up. His wounds were not caused by a modern day conflict, but by the remnants of a war that was waged more than 40 years ago, and is still destroying lives in this small Southeast Asian nation. Some 80 million unexploded bombs are scattered across the country - the deadly legacy of what became known as America's "secret war" in Laos - a CIA-led mission during the Vietnam War. In total, between 1964 and 1973, the US dropped more than two million tons of bombs - one of the heaviest aerial bombardments in history. Most of the munitions dropped were cluster bombs, which splinter before impact, spreading hundreds of smaller bomblets. To this day, less than 1% of the bombs have been removed, according to US-based NGO Legacies of War, which is spearheading the campaign to clear them. More than 20,000 people have been killed or maimed by the unexploded ordnance (UXOs) since the war ended, and currently, 50 people are maimed or killed every year. Around 40% of those are children.