" 83, 1529 (1999). S . F. Novaes, Standard Model: An Introduction, hep-ph:0001283 I. Models are usually man-constituted. That justifies talking about their purpose prior to talking about their consistency. Models are used as substitutes for originals because properties of the latter are of interest and the originals are not going to be investigated themselves. 163 Model Plane There may be a number of reasons for that such as taboos preventing from studying the original itself, or inability, the involved cost in terms of resources or moral damage being intolerable, or similar. For an investigator I it makes only sense to consider an entity M as a substitute of an entity O, if I can (1) establish an analogy, similarity, or similar relation between M and O that permits the substitution of O by M with respect to purpose and means, time-horizon etc. "

" The theory argues that the people buying the newspaper are themselves the product which is sold to the businesses that buy advertising space; the newspaper itself has only a marginal role as the product. The president of the main French television station TF1 stated this clearly in an interview in 2004, published in the book Les dirigeants face au changement (Éditions du Huitième jour) (see ): ". . . the job of TF1 is to help Coca-Cola, for example, to sell its product. [. . Electric Rc Model Plane. ] In order for an advertising message to be perceived, the brain of the television viewer must be available. "