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' It 's important because tremendous amounts of information is captured on individuals as they go through their daily lives , whether it 's food purchased at the grocery store , a bank card , medical information , parking tickets , whatever , ' she said . But at some point , the line between understanding and brute-force evaluation becomes too blurry to distinguish - - humanity is facing a genuinely monstrous challenge , and the beast gets stronger every year . April 11 , 1942 : a letter from an SS Major-General to the chief of Himmler 's personal staff describes how he has shot all the male Jews he could find , and will soon clear out the camp of women and children with the aid of a " delousing van " ( Entlausungswagen ) . All good historians revise their theories based on the latest state of the knowledge . After a lapse of one month the concentration of hydrogen cyanide and its combinations in the materials examined decreased on the average by 56 % ( from 28 % to 86 % ) .