You're not from around here are you? Oh dear...on Tuesday, a black kindergartener from Wellesley was put on the wrong bus at the end of his afterschool program. Which bus? Why, the Metco bus, which dropped him off in Dorchester, where another kid's mom took him home and called his parents. Now, there are many mix-ups in the world of five-year-olds and afterschool transportation -- in fact, my coworker had an identical wrong bus situation with her son last year, because there are no bus monitors to guide the little kids who aren't sure where they're supposed to go. But was there some subtle bias at work in this incident? Much hand-wringing ensues.