A married person falls deeply in love with someone else. A man of average income feels he cannot be truly happy unless he owns an expensive luxury car. A dieter has an irresistible craving for ice cream. Desires often come to us unbidden and unwanted, and they can have a dramatic impact, sometimes changing the course of our lives. In On Desire, William B. Irvine takes us on a wide-ranging tour of our impulses, wants, and needs, showing us...