(By David Perlmutt, dperlmutt@charlotteobserver.com) Six high school seniors from the Charlotte region will join 46 others from around the world to study at UNC Chapel Hill over the next four years on the prestigious Morehead-Cain scholarship.The Morehead-Cain, founded in 1945, is among the nation's most competitive merit scholarship programs, paying all expenses for four years of undergraduate study at Chapel Hill.