“Dikembe Mutombo” rebroadcasts a segment on the basketball star and his efforts to provide medical care in the Congo. “Lord of the Manor” rebroadcasts a look at the feud surrounding Gardiner Island. “Columbine Effect” rebroadcasts a look at how an Alabama school is having a problem dealing with a violent student because he is also considered disabled. “Andy Rooney” talks about mixed nuts.