Students at the John D. O'Bryant School of Mathematics and Science in Roxbury blocked doors and hallways because the headmaster chided them in a lecture for being tardy. The school responded with a lockdown. The students were clearly organized, as 200 of them were involved. Megan Woolhouse at the Globe notes that the student body isn't exactly a crew of troublemakers: "The protest was unusual at the school, which typically has a well-behaved student body......