Why do humans form long-term mateships? An evolutionary game-theoretic model / Daniel Conroy-Beam, Cari D. Goetz, and David M. Buss -- The why and how of defending belief in a just world / Carolyn L. Hafer and Alicia N. Rubel -- Positive versus negative valence: asymmetries in attitude formation and generalization as fundamental individual differences / Russell H. Fazio, Evava S. Pietri, Matthew D. Rocklage, and Natalie J. Shook -- We'll always have Paris: the hedonic payoff from experiential and material investments / Thomas Gilovich and Amit Kumar -- To nostalgize: mixing memory with affect and desire /Constantine Sedikides, Tim Wildschut, Clay Routledge, Jamie Arndt, Erica G. Hepper, and Xinyue Zhou.