https://www.sciencedaily.com/releases/2020/07/200709135545.htm

"Many children in the U.S. have not physically attended a school since early March because of the Covid-19 pandemic, and some have likened the period we're in now to an unusually long summer," said study author Allison Atteberry, an assistant professor at the University of Colorado -- Boulder. "Because our results highlight that achievement disparities disproportionately widen during the summer, this is deeply concerning."

"Teachers nationwide are likely wondering how different their classes will be in the coming fall," Atteberry said. "To the extent that student learning loss plays a larger-than-usual role this year, we would anticipate that teachers will encounter even greater variability in students' jumping-off points when they return in fall 2020."