A 21-year-old Chicago man who began college at age 9 and medical school three years later is about to become the youngest student ever awarded an M.D. by the University of Chicago. Sho Yano, who was reading at age 2, writing at 3 and composing music at 5, will graduate this week from the Pritzker School of Medicine, where he also received a Ph.D. in molecular genetics and cell biology. The school made some accommodations because of Yano's age. Unlike most students, who begin their Ph.D. training after their second year of medical school, Yano began his after his first year. That way, he was about 18 when he began his second year of studies toward his M.D.