EVANSTON – Therapy horses helped Northwestern University students de-stress during exams for the fourth year. Mane in Heaven brought miniature therapy horses to the Evanston campus, The Chicago Sun-Times reported. The Barrington-based organization has seven therapy horses that visit local institutions including hospitals, social service agencies and universities, said Dina Ewing Morgan, the nonprofit’s president, who also is a nurse. “When we first started doing this for college kids, we wondered, ‘Will it even have an effect?’ ” Ewing Morgan said.