Yale’s residential colleges play many roles in the lives of affiliated students and staff — home, workplace, and dining hall, social, recreational, and academic space, and cultural venue, too. They’re communities unto themselves in which residents strive to keep each other healthy and happy. Amid the COVID-19 pandemic, this latter commitment is more important than ever. COVID-19 testing sites are located within most of the colleges. See one of them in operation and hear from some of the people who are making the testing program work.