A Learned Skill
Some knowledge is only relevant if you live in a certain area and are exposed to specific things. For example, if you live near many animals, you might know which ones to stay away from.
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Military brats have the advantage of hearing different types of aircraft from a young age, allowing them to identify them more easily than most people. While civilians can often tell the difference between a plane and a helicopter, they usually can’t go beyond that without help.