They met with Conrad in the visitation room. In ten booths, separated by cinder-block partitions, inmates could chat with visitors through glass while seated at metal counters. Friedmann had been recorded kneeling for long periods below the counter in booth No. 2. The investigator got on her knees and noticed that the white paint on one cinder block in the partition was less glossy than the paint on the others. She hit the block with a hammer. It crumbled easily. She pulled a plastic package out of the resulting hollow. Inside were a razor blade, three handcuff keys, and a security bit, a device used to fasten fixtures. Also in the hollow were a fully loaded revolver and ten spare cartridges.
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。PDF资料对此有专业解读
任何伟大的事业，都不可能毕其功于一役。将长远目标分解为分时期、可落地、可检验的具体任务，谋定后动、善作善成，是攻坚克难的方法，也是行稳致远的智慧。
If rationals tend to be relatively resistant to approximations, it might be tempting to assume that the situation with irrational numbers is going to be worse. But, to cut to the chase, here’s the plot of approximations for r = π: