IOWA CITY — A range of graduate programs across Iowa’s public universities again have earned spots on the esteemed U.S. News & World Report’s Best Graduate School rankings — with some ticking up their respective lists and others falling amid unparalleled circumstances facing higher education.U.S. News’ 2022 Best Graduate Schools edition — made public Tuesday — evaluated a long list of graduate programs and specialties offered at hundreds of campuses nationally, including those in the six most popular fields of study: business, law, medicine, nursing, engineering, and education.