I find myself getting into a lot more philosophical discussions these days, with people I barely know. I’ve developed into quite a pontificator in my old age, but there’s some Mardi Gras knowledge ...

Metaphysics is the branch of philosophy that deals in the deep scaffolding of the world: the nature of space, time, causation and existence, the foundations of reality itself. It’s generally ...

Timothy Williamson is the Wykeham Professor of Logic at the University of Oxford. Updated August 20, 2010, 11:43 AM In principle, philosophy can use evidence from any genuine source of knowledge ...