Mental disability may affect about 2% of people, or about 120 million people. If each is affected to an extent equivalent to about 10 life-years, the total would be 1.2 billion life-years. At 40,000 life-years/character, that allows 30,000 characters for this and related articles. This article has about 8000 characters, with 2 photos adding the equivalent of about 1000 characters, thus there is potential for many more articles on these subjects.