Poet, peacemaker and precocious teen Mattie J.T. Stepanek was laid to rest in Maryland today in a ceremony befitting an icon, while people across the nation continued to pay tribute and celebrate the 13-year-old MDA National Goodwill Ambassador’s remarkable life and spirit. Celebrities, Mattie’s friends and loved ones, and other admirers made up the thousands who gathered at St. Catherine Laboure Catholic Church in Wheaton, Md., to remember, honor and laugh at memories of Mattie, who wowed the world with his message of peace, hope and courage. Former President Jimmy Carter delivered the eulogy for Mattie, with whom he’d enjoyed...