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