Amid a still-present pandemic, John Dickerson reports on the the challenges colleges face -- as they prepare to re-open in the fall. Scott Pelley tells us about the Greenwood Massacre -- a two-day assault in 1921 on a thriving black community in Tulsa, Oklahoma, and what we are learning today. Plus -- The Merit Systems Protection Board gives two million federal civil service workers -- including whistleblowers -- a place to appeal should they be disciplined, demoted or fired. Norah O'Donnell has the story on this week's "60 Minutes."