I learned something very important--surprising, even--at the 25th Annual Chicago Cares Serve-a-thon: high schoolers are still sticking gum under their desks. Lots of different colored gum. Okay. Okay. I also learned other things, too. I learned the school, Chicago Vocational Career Academy- -where Accenture focused its efforts--boasts graduates the likes of Dick Butkus , Bernie Mac , and Chicago's very own Dean Richards . Along with an impressive list of graduates, C