Prison

Discovered three years ago, the miscalculations were made public only recently. Two inmates set free early have been charged with homicides committed when they should have still been in prison.

About 15 percent of people in prison are infected with hepatitis C. Screening and treating inmates would save $750 million over 30 years and prevent many new cases in the general public.

"For my PTSD issues, jail is the least therapeutic atmosphere you could ever imagine," says Iraq veteran David Carlson. "You come in one way and you leave three times worse."

Instant noodles are a staple for inmates: a basis of recipe hacks, a form of currency. They've even helped defuse a prison riot, as an ex-inmate details in Prison Ramen, a book of stories and recipes.

Women in prison often eat to relieve stress or boredom. The resulting weight gain can make other physical and emotional problems worse. In one prison, spinning helps keep the pounds and rage at bay.

Although the government is responsible for providing health services to people in jail and prison, inmates are still often expected to pay for a share of the treatment.

The former owner of Peanut Corporation of America, Stewart Parnell, had been convicted of knowingly shipping tainted peanut butter that was linked to the 2009 deaths of nine people.

Two decades ago, a prisoner serving a life sentence had an idea of a college course. This year, over 100 universities and colleges will be offering a class just like the one he envisioned.

In Afghanistan, a woman who has premarital sex or cheats on her husband can be charged with moral crimes and imprisoned. Many of these women serve their time with their children by their side.

Many corrections officers oppose efforts to change the practice of isolating inmates. They say solitary confinement has been a trusted tool in American prisons for half a century.

Early experiments in isolating inmates took place at a Philadelphia prison in the 1800s. Though discredited as cruel, the practice was later revived nationwide during the drug war.

Curtis Carroll taught himself to read in prison. He also discovered a passion for finance. Now inmates and guards seek out his advice, and everyone calls him Wall Street.