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