Are there limits to what it is possible for us to know? “The last century brought the first hints of fundamental, inherent limits on the knowable. Kurt Godel discovered, to everyone’s shock, that some statements in mathematics can be neither proved nor disproved. And physicists showed that the laws of quantum mechanics prevent us from knowing simultaneously both the position and the momentum of a subatomic particle. Will the world continue to yield to man’s curiosity, or will we encounter evermore Godelian limits?”