20 most memorable moments on TV

Sony Electronics and the Nielsen television research company have ranked the most memorable American TV moments by asking people if they remembered watching them and also if they recalled where they watched it, who they were with and whether they talked to other people about what they had seen. The Sept. 11 tragedy was nearly twice as impactful as the second-ranked moment, which was the coverage of Hurricane Katrina in 2005. Here are the top 20.



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