When our oldest daughter, Sarah, was four years old the family kitten, Fluffy, contracted fleas. There ensued a primitive ritual of flea extermination that touched off the following discussion:Sarah: ‘Daddy, how did Fluffy get fleas?’Me: ‘Oh, I suspect she was playing with a cat that already had fleas. The fleas on that cat jumped off on to Fluffy.’Sarah : ‘And how did that cat get fleas?’Me : ‘Oh, probably from another cat.’Sarah : ‘But, Daddy, it can't go on and on (...) like that forever. The only thing that goes on and on like that forever is numbers.’. (shrink)

One of the cornerstone books of Western philosophy, Critique of Pure Reason is Kant's seminal treatise, where he seeks to define the nature of reason itself and builds his own unique system of philosophical thought with an approach known as transcendental idealism. He argues that human knowledge is limited by the capacity for perception and attempts a logical designation of two varieties of knowledge: a posteriori, the knowledge acquired through experience; and a priori, knowledge not derived through experience. This accurate (...) translation by J. M. D. Meiklejohn offers a simple and direct rendering of Kant's work that is suitable for readers at all levels. (shrink)

Author note: Matthew Lipman, Professor of Philosophy at Montclair State College and Director of the Institute for the Advancement of Philosophy for Children, is ...