The developing world’s curse from deep wells

Sing Ingti, 39, a watchman at a local high school in Asom (formerly Assam) state in Northeast India, has been suffering from serious, ill-defined bodily pain since 1995. His teeth are mottled, his leg bones are distorted and his legs are losing strength from what seems a mysterious ailment. But actually this is an all-too-common disease now afflicting h…