Hosted by Jane Pauley. In our cover story, David Pogue looks at the increased attention being paid to the investigation of UFOs. Plus: Tracy Smith sits down with actor Ewan McGregor, star of the Netflix series "Halston"; Mo Rocca visits a Kentucky home for retired racehorses; Ted Koppel talks with attorney Ben Crump about his defense of victims of civil rights abuses and police brutality; Jim Axelrod examines recent controversies involving the U.S. Secret Service; Steve Hartman reports on a war of signs; and Chip Reid talks with entomologists about the once-every-17-years emergence of cicadas, and how their protein can satiate the appetites of predators (and cookie lovers).

Hosted by Jane Pauley. In our Cover Story, Lee Cowan reports on the debate among North Dakotans about the true Geographical Center of North America. Plus: David Martin profiles Marine Cpl. Hershel "Woody" Williams, the last surviving Medal of Honor recipient from World War II; Mo Rocca experiences the allure of virtual reality vacations; Faith Salie investigates the possibilities of time travel; Martha Teichner unfolds the history of maps; Rita Braver sits down with former Senators Bob and Elizabeth Dole; Tracy Smith interviews comedian and impressionist Rich Little; and Serena Altschul checks out the bargains to be had at yard sales.