Collaboration and planning Despite their competition, the advocates of the theories have found inspiration in each other's ideas. Ostriker, for example, recently published a paper that used the Steinhardt-Spergel theory and shows how it may answer a different question about why enormous black holes form at the centers of galaxies. Steinhardt, Ostriker, Spergel and Turok, who was formerly a professor of physics at Princeton, currently are working on a paper that reviews the theories and suggests what observations to perform so that scientists can make the best appraisal of which ideas are correct. Fortunately, you solve the problem by observational tests rather than theoretical preferences. The Bulletin is published weekly during the academic year, except during University breaks and exam weeks, by the Office of Communications, Princeton University, Princeton, NJ 08544.
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