We are sitting on an isolated outcrop of ancient rocks, well to the west of Kimberley of past diamond digging fame, on the very edge of the Kalahari Desert - a mysterious expanse filled with an enduring aura of the unknown and a sense of timelessness with much still awaiting scientific discovery. Actually, the Kalahari is not even a desert as defined by annual rainfall, but rather a vast area of arid savanna thornveld and swathes of sprawling tawny grass patches...

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