"If a hen and a half lays an egg and a half in a day and a half, how many eggs will seven hens lay in six days?" "By rearranging the letters in the word 'plea, ' make three new words." "Which is heavier, milk or cream?" If you think you know the answers to these questions, you may be a genius Before the Mensa admissions test or the awarding of MacArthur "Genius Grants," self-described geniuses Robert A. Streeter and Robert G. Hoehn set out in the...