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@cliffle @mekkaokereke

I'm pretty sure I've heard of this too, in a slightly different form -- I've seen a claim that there are patches of the Amazon that have anomalously high densities of human-edible plants, which are thought to be a botanical remnant of prior cultivation.

I've never actually run it down for critical assessment.

Edit to add, might be this one (Nature paywall, but abstract is readable):

https://www.nature.com/articles/s41477-018-0205-y