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Humankind has evolved over many thousands of years from being simple tree-dwelling creatures, through those first tentative steps on the Serengeti and across east Africa, to hunter gathering, then to cultivation of a few crops, the domestication of animals and the creation of surpluses. From this, we have achieved the development of civilisation, written language, technologies such as paper and pen, the wheel, steam power, the internal combustion engine, space flight, computer technology and the internet. With all the wondrous developments we have collectively achieved as a species, and in the certain knowledge that I owe my complex lifestyle to ...