Dædalus was founded in 1955 as the Journal of the American Academy of Arts and Sciences. It draws on the enormous intellectual capacity of the American Academy, whose members are among the nation's most prominent thinkers in the arts, sciences, and humanities. The theme for the Summer 2015 issue is "On Water" M. Michalak & Christopher B. FieldWater, Climate, Energy, Inseparable & IndispensableChristopher B. Field & Anna M. MichalakWater in MythologyMichael WitzelWater Security in a Changing WorldJohn BriscoeProgress on Nonpoint Barriers & OpportunitiesAdena R. Rissman & Stephen R. CarpenterWater UnsustainabilityJerald L. SchnoorAdaptation in the Water Science & InstitutionsKatharine L. Jacobs & Lester SnowUrban Water-Supply ReinventionRichard G. Luthy & David L. SedlakDynamic Markets for Dynamic The Case for Water MarketingTerry L. A Brief History & Global-Scale Hypothesis Regarding Human-Water Interactions in the AnthropoceneCharles J. Vörösmarty, Michel Meybeck & Christopher L. Pastore