BERLIN (Reuters) - Over two-thirds of the detainees in the Guantanamo Bay prison are suffering from or at risk of mental problems because they are kept isolated in small cells with little light or fresh air, according to Human Rights Watch. In a report entitled "Locked Up Alone: Detention Conditions and Mental Health at Guantanamo," the group says 185 of the 270 detainees at the U.S. military prison for terrorism suspects are housed in facilities similar to "supermax" prisons. They spend 22 hours alone in cramped cells, have very limited contact with other human beings and are given little more...