▁the ▁son ▁of ▁Tor an ▁and ▁Bay ta ▁D are ll ▁and ▁the ▁father ▁of ▁Ark ady ▁D are ll , ▁and ▁was ▁known ▁for ▁his ▁adv ances ▁in ▁electro ence phal ographic ▁analysis . ▁ ▁He ▁was ▁able ▁to ▁quit ▁his ▁job ▁as ▁he ▁receives ▁a ▁st ip end ▁from ▁the ▁Foundation ▁due ▁to ▁his ▁mother ' s ▁services ▁in ▁th wart ing ▁the ▁M ule . ▁ ▁The ▁st ip end ▁is ▁sufficient ▁for ▁a ▁comfortable ▁home ▁in ▁a ▁pleasant ▁sub urb , ▁and ▁allows ▁the ▁presence ▁of ▁a ▁servant ▁named ▁Pol i ▁to ▁take ▁care ▁of ▁him ▁and ▁his ▁daughter . ▁ ▁His ▁ab rupt ▁res ignation ▁was ▁due ▁to ▁fear ▁that ▁the ▁Second ▁Foundation ▁might ▁learn ▁of ▁his ▁activities ▁and ▁adjust ▁him . ▁ ▁T ogether ▁with ▁P elle as ▁Anth or , ▁J ole ▁Tur bor , ▁Dr . ▁El v ett ▁Sem ic ▁and ▁Hom ir ▁M unn , ▁he ▁tried ▁to ▁locate ▁the ▁Second ▁Foundation ▁in ▁hopes ▁of ▁eventually ▁destroy ing ▁it . ▁ ▁He ▁discovered ▁that ▁the ▁mental ▁manip ulations ▁by ▁the ▁Second ▁Foundation ▁left ▁a ▁detect able ▁pattern ▁in ▁brain ▁wave ▁activity , ▁and ▁called ▁it ▁a ▁“ T am per ▁Pl ate au .” ▁Using ▁this , ▁he ▁could ▁determine ▁who ▁had ▁been ▁directly ▁affected ▁by ▁the ▁Second ▁Foundation . ▁With ▁Sem ic , ▁he ▁developed ▁a ▁mind ▁static ▁device ▁capable ▁of ▁protect ing ▁against ▁this , ▁and ▁further ▁ref ined ▁it ▁into ▁a ▁weapon ▁against ▁Second ▁Foundation ers . ▁With ▁the ▁use