Categorizing UFO Sightings

Have we been visited by extraterrestrial life? And how much does the government really know when it comes to UFOs? Garrett Graff’s latest book, UFO: The Inside Story of the US Government’s Search for Alien Life Here — and Out There, investigates these questions and more. The national-security reporter recently sat down with Apple News In Conversationhost Shumita Basu to share his findings.