The keystone metaphor. The keystone is the component of a
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From Metaphors to Formalism: A Heuristic Approach to Holistic Assessments of Ecosystem Health

Aimee Nolte on X: Not sure why @NBCNews keeps saying Pennsylvania, known as the “keystone” state COULD be known as the “checkmate” state. Keystone is more accurate, in my book. /
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