Surrounded by concrete walls and metal bars, prisoners can’t enjoy the benefits of being in nature, so researchers did the next best thing by showing videos of things like forests, the ocean, rivers and fireplaces to a group of inmates three to four times a week for an entire year. The study found that those inmates had reduced levels of aggression and had fewer violent infractions than prisoners who didn’t watch the same videos. Nature helps to reset the immune system and calm the mind, benefits which could be useful to help ‘correct’ prisoners more effectively.