Joseph Weizenbaum, who made history in computing with his program "Eliza," has been known for many years as a critic of unreflective computer enthusiasm. In his essays, he highlights the contexts in which computers are developed and used, pointing out their close ties to military research. He critiques the fantasies of omnipotence found in theories of artificial intelligence and calls for a culture of responsibility among scientists for their work. The essays collected here shed light on the contexts, problems, and weaknesses of the new media and internet world that are often overlooked in public debate. They encourage a critical and responsible approach to new technologies in the computer age.