1. Elizabeth Gilbert's book Committed provides a good cultural and historical perspective on Western marriages packaged in an entertaining narrative that I am sure Meg will enjoy. For the abbreviated version, check out one of these two interviews: One with Diane Rehm (~1 hr) or another with Q TV's Jian Ghomeshi (20:45).
2. A 17-lecture psychology course on Academic Earth called Communication and Conflict in Couples and Families. I found lectures 7 through 16 to be most important.
3. Peter Salovey's 70 minute lecture called Evolution, Emotion, and Reason: Love, described as follows:
Peter Salovey (Professor of Psychology and Dean of Yale College) introduces students to the dominant psychological theories of love and attraction. Specific topics include the different types of love, the circumstances that predict attraction, and the situations where people mistakenly attribute arousal for love.
4. Jonathan Haidt's The Happiness Hypothesis, while providing little direct advice on how to have a happy marriage, is the best book I have found for a definition of what the good life is and advice on how to get there. In fact, this is probably the most important item on the list.
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Dearest reader, what am I missing? What is the best source of marital wisdom you have encountered that my sister (and I) should know about?