In the first part of the lecture, Professor Gendler finishes up the discussion of non-standard responses to the Trolley Problem by presenting Cass Sunstein’s proposed resolution. This is followed by a general discussion of heuristics and biases in the context of risk regulation. In the remainder of the lecture, she introduces two additional puzzles: the puzzle of ducking vs. shielding (which is due to Christopher Boorse and Roy Sorensen) and the puzzle of moral luck.

The Trolley Problem, as discussed in the last lecture, is the problem of reconciling an apparent inconsistency in our moral intuitions: that while it is permissible to turn the runaway trolley to a track thus killing one to save five, it is impermissible to push a fat man onto the trolley track, killing him to save the five. In this lecture, Professor Gendler reviews several “non-classic” responses to this problem, each of which aims to bring the two cases, and hence our apparently conflicting judgments about them, together.

The discussion of Kant from last lecture continues with a statement and explication of his first formulation of the categorical imperative: act only in such a way that you can will your maxim to be a universal law. Professor Gendler shows how Kant uses the categorical imperative to argue for particular moral duties, such as the obligation to keep promises. In the second part of the lecture, Philippa Foot’s Trolley Problem is introduced, which poses the problem of reconciling two powerful conflicting moral intuitions.

Professor Gendler opens with a final criticism of Utilitarianism from Bernard Williams: in some cases, a good person should feel reluctant to do an act which brings about the greatest happiness, even if it is the right thing to do. The second half of the lecture introduces Kant’s deontological moral theory. In contrast to consequentialism, deontology holds that it’s not the outcome of actions that matter for their moral valence, but rather the will of the agent performing such actions. The outlines of Kant’s deontological theory are presented, to be continued in the next lecture.

Professor Gendler begins with a general introduction to moral theories–what are they and what questions do they answer? Three different moral theories are briefly sketched: virtue theories, deontological theories, and consequentialist theories. Professor Gendler introduces at greater length a particular form of consequentialism—utilitarianism—put forward by John Stuart Mill. A dilemma is posed which appears to challenge Mill’s Greatest Happiness Principle: is it morally right for many to live happily at the cost of one person’s suffering?

The global AIDS pandemic furnishes a case study for many of the themes addressed throughout the course. While in the developed West the disease largely afflicts concentrated high-risk groups such as intravenous drug users and the sexually promiscuous, in Southern Africa it is much more a generalized disease of poverty. In countries such as Botswana and Swaziland, the economic and social consequences of the disease have created a vicious circle, whereby the devastation wrought by AIDS severely impedes public health efforts and prepares the way for further infection.

This lecture begins with a central, if often overlooked, turning point in the Civil War--the re-election of Abraham Lincoln in 1864. Although the concerted efforts of northern Peace Democrats and a palpable war weariness among the electorate made Lincoln's victory uncertain, timely Union victories in Atlanta and Mobile in September of 1864 secured Lincoln's re-election in November. This lecture concludes Professor Blight's section on the war, following Lee and Grant to Appomattox Courthouse, and describing the surrender of Confederate forces.

There are other ways in which we can perceive the existence of the atmosphere, predominantly through our perceptions of pressure. Not all planets have atmospheres, and the existence of an atmosphere depends on the ability of gas molecules to remain trapped close to a planet by its gravitational force. The molecular velocity of each gas molecule depends upon its molecular weight, and must exceed the escape velocity of the planet to leave the atmosphere.

This course studies the atmosphere and the ocean as parts of Earth’s climate system. The climate is studied in both quantitative and qualitative ways through use of the textbook, lectures, labs and problem sets. Today’s lecture includes an examination of Hurricane Irene that hit Connecticut a few days ago on August 28. For this, we use several website sources of local weather information: satellite, radar, tide gauges. The atmosphere is gravitationally attracted to the Earth and is composed of gases that are invisible to the human eye.

After reviewing the main themes of this course, Professor Shiller shares his views about finance from a broader perspective. His first topic, the morality of finance, centers on Peter Unger's Living High and Letting Die and William Graham Sumner's What the Social Classes Owe Each Other. Subsequently, he addresses the hopelessness about the world’s future that some see from Malthus' dismal law from the Essay on the Principle of Population, but contrasts it with a positive outlook on purposes and goals in life.