Ãíùñßæåé êÜðïéïò áí ëåéôïõñãåé áýñéï ç ãñáììáôåßá; ïðïßïò îÝñåéò áò áðáíôÞóåé ðáñáêáëþ åßíáé åðåßãïí!!
If you can't explain it simply, you don't understand it well enough..
Albert Einstein
