Hockinson — More than 150 seniors at Hockinson High School got a lesson in saving lives last month during a CPR presentation and training. Student Arianna Bulder organized the event for her senior project. The students learned about hands-only CPR by Clark County Medical Program Director Lynn Wittwer, and Clark County Fire District 3 personnel gave instruction on the emergency maneuver, where a chest is compressed at a rate of about 100 times a minute.