PBS NewsHour | Clip | Why the latest UFO report is a turning point on the issue

The U.S. intelligence released a preliminary --and watershed -- report on unidentified aerial phenomena or UFOs. The report is the government’s most concerted and serious attempt to understand an issue without the fear of being ridiculed. The report found no evidence of aliens but acknowledged at least 143 unexplained sightings since 2004. NewsHour Science Correspondent Miles O'Brien joins.