There's still a ton of debate as to which cells in the human brain can regenerate, but not all of them. Joseph Altman was doing studies with radioactive molecules and found that there were new cells incorporating this radioactive marker. In the 80s, some people studying birds started to say, hey, actually, I think this could be true in birds. It wasn't till the early 90s when people finally said, hey, you know what, looks like there are some cells in the brain with like regenerative properties.

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