Another study found that despite years of being told that suspensions. a student was stabbed and killed in history class. Notable, the latest state data says that this school had only 10 suspensions. Assaults on teachers are on the rise. "There seems to be prejudice based on name valence [or associations]," says study co-author Wiebke Neberich. of course, from our own history," Neberich said. The researchers concluded that an "unfortunate"…