An 80 year old man was sitting on the sofa in his house along with his 45 years old highly educated son. Suddenly a crow perched on their window. The Father asked his Son, "What is this?" The Son replied "It is a crow". After a few minutes, the Father asked his Son the 2nd time, "What is this?" The Son said "Father, I have just now told you "It's a crow". After a little while, the old Father again asked his Son the 3rd time, What is this?" At this time some ex-pression of irritation was felt in the Son's tone when he said to his Father with a rebuff. "It's a crow, a crow". A little after, the Father again asked his Son t he 4th time, "What is this?" This time the Son shouted at his Father, "Why do you keep asking me the same question again and again, although I have told you so many times 'IT IS A CROW'. Are you not able to understand this?" A little later the Father went to his...