11 points
It really amazes me how theater actors are able to memorize an entire play.
8 points
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They probably use the memory palace technique. Each line can be thought of as a picture that reminds them of the line. Then you place that picture inside a fake palace or museum in your mind. Then you take a tour of the museum or palace in your head and you remember the lines. The technique is also used to remember large numbers like pi.
