When big old Redwood trees are cut down or fall, a cross-section can be drawn relating the rings to historical events.
![\"3ebb56a82499b4f6f9d07200b5e5de29\"](\"https://nomdeplume707.blog/wp-content/uploads/2017/04/3ebb56a82499b4f6f9d07200b5e5de29.jpg\")
Seems to me you could do a cross-section of a human brain and mark it similarly for events in their life.
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