A group of scientists at Northern Arizona University is now working on a way to make a computerized bionic ankle act like a real leg. Inspired by the animal world, they’ve got a new idea about how muscles behave like springs.
At one of the harshest federal prisons in the country, inmates are left with their wrists and ankles cuffed for hours, days and sometimes weeks at a time. The prison says it's a safety issue. Inmates say it's punishment.