Know the knowings

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In aboat a doctor, a scientist was going with sailor. The boat was in the midlle of the river. There was quarrel started between two experts. The doctor says that Doctors know lot of things in the world that useful for human beings. The scientist said that scientists know lot more things in the world that useful for human beings. suddenly there was a hole in the boat , lot of water comes through the boat from river. that time sailor asked to doctor you may know many things but you know swimming. doctor said no and the same reply from scientist too. SAILOR SAYS I DO NOT KNOW MANY THINGS IN THE WORLD AS BOTH OF YOU KNEW, BUT I KNOW SWIMMING AND I AM GOING TO SAVE MY LIFE. THE MORAL IS KNOW THE KNOWINGS FIRST THAT MAY SAVE YOU