"Hopalong nodded. Carefully he went over in his mind all he had heard. He had the retentive memory of a Western man, but he was taking no chances. Upon what he had just heard his life might well depend, and even more than his life, the lives of Pamela and her father."
The passage above is from The Rustlers of West Fork, by Louis L'Amour. It illustrates one of my chief concerns about our modern age, that we are allowing our minds to atrophy through lack of use. Consider how active men's minds were in a day when the use of their memories might just preserve their lives.