The Chenango County Sheriff’s Office announced that a presentation entitled “Safe Schools and Healthy Students” will take place next Friday at the Sherburne-Earlville High School Auditorium beginning at 8:00 a.m. The featured speaker is Lt. Col. Dave Grossman, who is known as one of the world’s foremost experts on human aggression and violent crime. The presentation will offer response technologies based on the most recent school safety research. The presentation is open to the public and admission is free.