Mount Desert Island High School juniors Lindsey McEachern and Hannah Chamberlain are batterymates for the softball team. McEachern is the pitcher and Chamberlain is her catcher. In addition to softball, they also love mathematics and take an AP (Advanced Placement) calculus class together. So when their calculus teacher, Sara ‘Bo’ Greene, told the class she wanted them to produce an independent project, McEachern and Chamberlain thought it would be interesting to team up and do one related to softball. And that is exactly what they did. “It was an instinctive thing,” said McEachern.