COVID-19 roundup: fall strategy shifts in waves; 'zero' mortality risk for students?

The number of colleges reversing previously announced plans to bring many of their students back to campus this fall has continued to climb this week, with some going entirely virtual for the semester and others starting the semester online and delaying students' return (at least for now). Meanwhile, significant numbers of institutions are sticking to their plans to reopen their physical campuses -- and some of their leaders are doing so with gusto, as is the case with Purdue University...