Most memories disappear within minutes, but those that survice the fragile period strengthen with time.
Long-term memories are formed in a two-way conversation between the hippocampus and the cortex, until the hippocampus breaks the connection and the memory is fixed in the cortex--which can take years.
Our brains give us an approximatate view of reality, because they mix new knowledge with past memories and store them together as one.
The way to make long-term memory more reliable is to incorporate new information gradually and repeat it in timed intervals.
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