At the University of Illinois at Urbana-Champaign, more than 40,000 students take tests twice a week for the coronavirus. They cannot enter campus buildings unless an app vouches that their test has come back negative. This is one of the most comprehensive plans by a major college to keep the virus under control. Other researchers put together a detailed computer model that suggested these measures would work, and that in-person instruction could go forward this fall. But the predictive model included an oversight: It assumed that all of the students would do all of the things that they were told to.

Source: New York Times September 10, 2020 21:49 UTC