a professor was traveling by boat on his way he asked the sailor "do you know Biology Ecology Zoology Geography and Physiology " the sailor said no to all his questions the professor asked again "what the hell do you know on will die of illiteracy" after a while the boat started sinking the sailor asked the professor "do you know swimming and escaping form shark " the professor said no and no and the sailor well shark and crocodile will eat your ass head and you will die because of your mouth