Melissa McCarthy

NBCUniversal

Why do Jimmy FallonĀ and Conan O'Brien do fewer President Trump jokes than Stephen Colbert or Seth Meyers? Why aren't some late-night TV hosts very political?

PBS

Ken Burns' highly anticipated look back at "The Vietnam War" premieres Sunday, Sept. 17, opposite the annualĀ  Emmy Awards.

PBS devotes 18 hours to the film at 8 p.m. Sunday through Thursday for two weeks.