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According to legend, it was while lazing in bed and staring at a fly on the ceiling that Descartes, habitually a late riser, conceived of the “X” and “Y” axes that comprise the coordinate grid, now the bane of so many grade-schoolers whoAccording to legend, it was while lazing in bed and staring at a fly on the ceiling that Descartes, habitually a late riser, conceived of the “X” and “Y” axes that comprise the coordinate grid, now the bane of so many grade-schoolers who lose sleep studying its properties....more