thank you very much for new knowledge. dear madam for me even I studied a range of subjects I feel my self i don't have anything on my head!. it may be see as funny but I'm little bit worrying about that.im engaging with some engineering stuff I passed somehow my examinations, but I feel my head is empty. can you explain why is that? is it dangerous ? I searched on web and some people say its normal. but my subjects are more practical so I feel unstable under my mind about my self on practical field work rather than theory and working with books. is that means I'm strengthen for theory and writing stuff only not involving field work?