Almost everyone who lives in Northern Colorado has probably heard of Loveland's Valentine remailing program. The U.S. Postal Service says the program, which turns 70 in 2016, is the largest of its kind in the country, handling between 150,000 and 200,000 pieces of mail each year. Beginning as early as December, cards and letters start pouring in from all over the world. For about two weeks before Valentine’s Day, the sound of stamping fills the Loveland Chamber of Commerce.