The College Test – John Dickerson reports on the challenge to colleges and students as the institutions prepare to reopen in the fall amid the still-present pandemic. 

Exhume the Truth – History has largely ignored the Greenwood Massacre, a two-day assault in 1921 on a thriving black community in Tulsa, Okla., in which an estimated 300 people – mostly African American men, women, and children – were killed. Scott Pelley reports on a community trying to uncover the facts and the bodies in what's been called the worst race riot in American history. 

Three Empty Chairs – 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. As Norah O'Donnell reports, the board now has a backlog of nearly 2,900 cases, because of the failure of the Senate to confirm any new members to the board in over eight years. 

Voting in the Pandemic – Americans will vote for president in just a few months, and the pandemic has forced election officials to explore ways to keep the public safe at the polls and offer alternatives to in-person voting. As Bill Whitaker reports, so far, it's not been an easy task.

Wild West of Testing – A three-month investigation reveals federal officials failed to immediately stop the distribution of many COVID-19 antibody tests they knew were flawed, leading to inaccurate data about the spread of the virus. Sharyn Alfonsi reports. 

Probiotics – Consumers spend tens of billions of dollars on probiotics that promise to improve health. Dr. Jon LaPook takes a look at the so-called "good bacteria" and whether all the hype is true.