Once a young professor was making a sea voyage . He was a highly educated man with a long tail of letters after his name , but he had very little experience about life . In the crew of the ship on which he was traveling was an illiterate old sailor . Every evening the sailor would visit the cabin of the young professor to listen to him hold forth on many different subjects . He was very impressed with the learning of the young man . One evening as the sailor was about to leave the cabin after several hours of conversation , the professor asked " old man , have you studied geology ? " . What is that sir ? ... The science of the earth . " no sir , I have never been to any school or college . I have never studied anything " ... Old man , you have wasted a quarter of your life . With a long face the old sailor went away . " if such a learning person says so , certainly it must be true then I have wasted a quarter of my life " . The next evening again as the sailor about to leave the cabin , the professor ask him " old man , have you studied oceanography ? " . What is that , sir ? . The science of the sea . No sir , I have never studied anything . The professor said : old man , you have wasted half of your life . With a long face the old sailor told himself " if the learning person says so then I'm really have wasted half of my life . And the next evening again the professor ask : old man , have you studied meteorology ? .... What is the answer I will continue this story tomorrow , have a good day everyone . Love you all . Anhthuy .