A few years ago Avishai Dekel gave up chess in favor of mud wrestling. Dekel is a cosmologist and he isn't known to frequent strip clubs. But there are two types of cosmologists: those who study fundamentals, like the initial conditions and content of the early universe, and those who immerse themselves in the messier problem of galaxy evolution, replete with gas and stars that heat and cool, form jets, make black holes, and sometimes explode.
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