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The turning point to the spread of agriculture in the Old World was almost certainly the occurrence of two forms of what with a large, full head of seeds. Before 800 BC wheat was not the luxuriant plant it is today. It was merely one of many wild grasses that spread throughout the Middle East. By some genetic accident, the wild wheat crossed with a natural goat grass and formed a fertile hybrid. ... Now we have a beautiful ear of wheat, but one which will never spread in the wind because the ear is too tight to break up... The Principle of Uncertainty is a bad name. In science or outside it, we are not uncertain, our knowledge is merely confined within a certain tolerance. We should call it the Principle of Tolerance.