Each time a person learns a piece of information, it is not stored in the brain in isolation, Kahana said. Instead, it is wrapped up in context: how it was acquired (reading a book, watching TV) and the way it was presented (learning about Napoleon as part of a lesson on battlefield tactics, say, or in the context of studying imperialism). The context of a memory also includes unrelated details such as the learner’s location and what else he or she was thinking about at the time.