We’re nearing the tail end, ’ ” recalled Nina Heller, a junior at American University in Washington, D.C., where administrators brought back a mask mandate about a month after lifting it.... “ The pandemic is still with us.” CaliforniaConfused?... “ There’s definitely been a lot more uncertainty than there’s been on campus since COVID hit.” Philadelphia recently brought back its mask mandate, leading the University of Pennsylvania and Temple University to again require masks starting Monday...