When Little Joe’s Books, a brand-new bookstore in Katonah, NY (pop. 5,000), decided to enter the contest, they asked residents to donate balls of yarn and loan them sweaters, blankets, and scarves. The people of Katonah delivered: Little Joe’s received over 200 knitted items, and over 1,000 balls of yarn. The store looks beautiful. But we really loved what’s happening next: When...