Many philosophers of knowledge question how much we can ever really know about anything. The eighteenth-century Scottish philosopher David Hume identified one of the fundamental problems we’ve had with many of the questions I’ve been tackling: that of being stuck inside the system. If we are going to apply scientific methods to establish that we actually know something, we get into a loop because we are using scientific and logical arguments to prove that these methods are sound. It is impossible to assume an outside position.

