Mr. Ved555, I appreciate you ability of guessing but also want to tell you that this is the way how people make false history, by guessing! However, you are right that I failed to get position in the career that I  initally chose. But that was not engineering but medicine. So one kind suggestion for you don't assume that all geologists have chosen geology because they failed to get position in engineering otherwise you will be also like that story (history)- teller. One more thing I don't feel bad that I couldn't get into engineering field. I love my work but I have respect for all others' work. There is no single person or single group of people carrying the whole world in their shoulder. Lastly I have already admitted the flaw on the historical documents I read in my early days so I don't need further explanation from you.