A whopping 39 million adults under 65 have left college without completing a credential. But in the 2020-21 academic year, just 2.4% reenrolled in class. That’s according to a recent report from the National Student Clearinghouse Research Center. Released early last month, it showed the number of stopped-out students grew by 1.9 million, or 5.3%, since the last time numbers were calculated in December 2018.