An old man was sitting in the courtyard of his house along with his son who had received high education. Suddenly a crow perched on a wall of the house. The father asked the son: What is this? The son replied: It is a crow. After a little while the father again asked the son: What is this? The son said: It is a crow. After a few minutes the father asked his son the third time: What is this? The son said: Father, I have just now told you that this is a crow. After a little while the old father again asked his son the fourth time: What is this? By this time some statement of irriation was felt in the son's tone when he rebuffed his father: Father! It is a crow, a crow. A little after the father again asked his son: What is this? This time the son replied to his father with a vein of temper. Father: You are always repeating the same question; although I have told you so many times that it is a crow. Are you not able to understand this? The father went to his room and came back with an old diary. Continues...