In this collection of lectures that Richard Feynman originally gave in 1963, unpublished during his lifetime, the Nobel Prize-winning physicist discusses several of the ultimate questions of science. What is the nature of the tension between science and religious faith? Why does uncertainty play such a crucial role in the scientific imagination? Is this really a scientific age?Marked by Feynman's characteristic combination of rationality and humor, these lectures provide an intimate glimpse at the man behind the legend. He says at the start of his final lecture, "I dedicate this lecture to showing what ridiculous conclusions and rare statements such a man as myself can make." Rare, perhaps, and irreverent, sure. But ridiculous? Not even close.