Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and through controlled airspace, and can provide advisory services to aircraft in non-controlled airspace.
While the genre of some works of literature can be debated, Macbeth written by William Shakespeare seems to fit into a perfect mold. Aristotleâs definition of a tragedy, combining seven elements that he believes make the genre of a work a tragedy, is that mold. Displaying all seven aspects, Macbeth fits the definition precisely. Key elements in the play substantiate the fact that Macbeth is a serious story, the first elements of Aristotleâs definition.
in greek medieval and renaissance thought the traditional four elements form the basis for a theory of medicine and later psychological typology known as the four humoursand classical thought in classic times medicine was equated with philosophy and three greek philosophers hippocrates c 460 370 b c e plato 427 348 b c e and aristotle 384 322 b c e contributed to the vision of health disease and the functions of the bodylthough they had differences in general they saw health as an equilibrium of the body as determined by the four humors sap in plants and the blood in animals is the fount of life other body fluids phlegm bile faeces became visible in illness when the balance is disturbed