Nkechi Colwell: The British nurse who dedicated 35 years of her life to serving mentally ill patients in Abia village Three weeks ago, after a church service in London, an elderly lady in a wheelchair tapped me on the back. She asked me in Igbo, "Are you Igbo?" I was surprised but nodded in affirmation. She smiled and asked, "Which part of Igbo land are you from?" I told her, and she smiled again, saying, "M ruru ọrụ na Steeti gị for more than 35 years," which loosely translates to, "I...