http://www.ozy.com/flashback/john-edmonstone-the-freed-slave-who-inspired-charles-darwin/31600
https://blogs.scientificamerican.com/urban-scientist/you-should-know-john-edmonstone/
http://www.africaresource.com/rasta/sesostris-the-great-the-egyptian-hercules/john-edmonstone-the-black-genius-who-schooled-charles-darwin/
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