"Wouldyoumindtellingme,Doctor,"Bobasked..."howyoudetectamentaldeficiencyinsomebodywhoappearscompletelynormal?""Nothingiseasier,"hereplied."Youaskhimasimplequestionwhicheveryoneshouldanswerwithnotrouble.Ifhehesitates,thatputsyouonthetrack.""Well,Whatsortofquestion?""Well,youmightaskhim,'CaptainCookmadethreetripsaroundtheworldanddiedduringoneofthem.Whichone?'Bobthoughtforamoment,andthensaidwithanervouslaugh,"Youwouldn'thappentohaveanotherexamplewouldyou?ImustconfessIdon'tknowmuchabout ...