All this week, we’re talking about incarceration in America. According to the Bureau of Justice Statistics, the U.S. incarcerated 319,598 in 1980. By 2010, that number had jumped to over 1.6 million. Our series focuses on juvenile justice and life-without-parole sentences for teenage convicts; solitary confinement, and how new research on the effects of isolation is prompting states to change their prison systems, and challenges former inmates face once they re-enter society.