About 200,000 year ago an early homo sapien emerged from his cave, pulled on a woolly mammoth cardigan and fired up the Nespresso machine. Looking out over the Rift Valley with his morning brew, he felt the burden of familiarity. The valley had become as crowded and noisy as hippos and giraffes had become scarce. It was time to go for a very long walk.
A few billion people later, homo sapiens, by then a success of plague proportions, underwent another transformation, this time academic rather than geographic.