You know the feeling. It's that rage you get when someone cuts you off on the highway; you just want to floor it and flip the bird. Anger is a corrosive emotion that can run off with your mental and physical health. So do you hold it in? Or do you let it all out? Anger doesn't dissipate just because you unleash it. Some insight into why we have it and how it works can help you better manage this raw emotion.