If our small minds, for some convenience, divide this glass of wine, this universe, into parts—physics, biology, geology, astronomy, psychology, and so on—remember that nature does not know it! — Richard Feynman
The bounds of all departments of human research and speculation are inherently provisional, indefinite, and fluctuating; moreover, the lines of demarcation are hopelessly interlaced, for real men and the real universe in which they live are so intricate as to defy all attempts even of the most patient and subtle German to establish satisfactorily and permanently the Begriff und Wesen of any artificially delimited set of natural phenomena, whether words, thoughts, deeds, forces, animals, plants, or stars. Each so-called science or discipline is ever and always dependent on other sciences and disciplines. It draws its life from them, and to them it owes, consciously or unconsciously, a great part of its chances of progress. – James Harvey Robinson's New History