Grade 2 students at Arthur Public School learned a lot about levers, pulleys, screws, incline planes, wheels and axles, through the Scientists in the Classroom program with “scientist” Cathy Jonkers. In the photo Joshua Hummel and Stacy Tasker use a can crusher as part of the afternoon program on Tuesday, Jan. 17. A number of parents came in to help Jonkers and science teacher Nancy Beesley.