BILLINGS, Mont. -- It started as a way for one Montana family to talk about the tragic school shooting of 26 children and adults. Now it's blossoming into an international movement to build a chain of handmade paper hearts to stretch almost across the country.Gala Thompson and her family's Paper Hearts Across America estimate it would take about 19 million small paper hearts to connect Billings, Mont., to Newtown, Conn.