Tuesday was the first day of school for Danbury students, and there are a lot of them this year. More than 12,300 students in grades PRE-K through 12 returned to class yesterday in Danbury. There were lots of new faces among students, and also some new faces among the teaching staff. By the end of the next 180 days or so, they all will get to know one another better. This year, there are about 100 new teachers, and they actually began the year a couple of weeks ago with orientation.