Elsewhere on Friday: \n\n– The long reign of the pdf. \n\n– The Black American amputation epidemic. \n\n– More evidence US China stance will stay hawkish. \n\n– Twitter locks Chinese embassy account after Uighur treatment defence. (BBG,$) \n\n– How Britain paid for WW1. \n\n– Flaws in the Model 3. \n\n– How falling costs will secure solar’s dominance. \n\n– The company democratising art.