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On the other side of the bars from Friedmann, Hall was asking similar questions about the cruelties of incarceration. People who work in corrections often speak of their talents as lying in one of two directions. You’re either a “security person,” most concerned with controlling inmates, or you’re a “programming person,” interested in helping them occupy their minds, perhaps to learn and grow. As a case manager in the Criminal Justice Center, Hall realized that he was a programming person. But such work was an afterthought there, so in 1991 he left to be the program director at a C.C.A. jail, in Davidson County, that was comparatively well managed. He created educational and community-interaction programs for the inmates.，更多细节参见clash下载 - clash官方网站
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We start by picking a real number r. Your job is to approximate it as closely as possible using a rational fraction a / b with a reasonably small denominator. The approximation can’t be the same as r. Is this task easier if r itself is rational or irrational?