Comedian Mo Amer is of Palestinian descent, but he grew up in Kuwait and Houston. So besides his native Arabic, he learned to speak Spanish, and the kind of English that sets Texans at ease. Amer stars in a new Netflix comedy about his life, called Mo.Also, veteran cold case investigator Paul Holes talks about pursuing serial killers, and the emotional toll of obsessing over gruesome crime scenes. He played a key role in tracking down the Golden State Killer. He has a new memoir called Unmasked: My Life Solving Cold Cases. John Powers reviews the documentary Three Minutes: A Lengthening, which shows a jewish neighborhood in Poland before it was erased by the Holocaust.