“Not So Perfect a Match” rebroadcasts a segment on how close DNA matches can lead police to investigate the families of suspects. “An American in North Korea” rebroadcasts an interview with the last American defector that is still living in North Korea. “Dog Nut” rebroadcasts an interviews with a Simpsons television producer who is leading an effort to train dogs for the deaf. “Andy Rooney” talks about watches.