How America's prisons turned a "brutal and inhumane" practice into standard procedure Originally meant to be brief and exceptional, solitary confinement in U.S. prisons has become long-term and common. Prisoners spend twenty-three hours a day in featureless cells, with no visitors or human contact for years on end, and they are held entirely at administrators' discretion. Keramet Reiter tells the history of one "supermax," California's Pelican Bay...