Read Slate's complete coverage of the tragedy in Norway.
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Explainer thanks Elin Haugsgjerd Allern, Øivind Bratberg, Tore Hansen, Knut Heidar, and Anders Ravik Jupskås of the University of Oslo; Robert Blitzer of ICF International; Elizabeth Castelli, author of Martyrdom and Memory: Early Christian Culture Making; and Eric Holdeman of Eric Holdeman and Associates.*
Correction, July 26, 2011: This article originally misidentified Robert Blitzer as Robert Blazer.