“It is known in the West as Ockham’s Razor, but Indian philosophers call it the Principle of Lightness, for it dictates that we choose the ‘lighter’ of two competing theories. The Principle of Lightness may be stated as follows: given two competing theories, each of which is equally good at explaining and predicting the relevant phenomena, choose the lighter theory, that is, the theory that posits the least number of unobservable entities.”