Gertrude Crumpton does her homework in the car after school while her sister, Madeline, drives them from the University School of Nashville campus to East Nashville. She has to finish in time to get to work at Hankabee Button Co., her custom button (and mirror, and bottle-opener) business. In only two years, the third grader has developed an impressive client list (including Kacey Musgraves) and a vision befitting a pint-sized CEO. Click for article