I'm posting this following a conversation I had with the botanist John Parker (Director, Cambridge University Botanic Garden, 1996-2010) after a public reading from the book Deciphering Ancient Minds: The Mystery of San Bushman Rock Art by David Lewis-Williams and Sam Challis (Thames & Hudson, 2012). The South African San "bushmen" and their culture are a particular interest of John's, and we brie...

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