"No regrets" might be a popular modern-day mantra, but it's virtually impossible to live your life without wishing you could do certain things over. Some people try to ignore these feelings; others wallow in them. But author Dan Pink, who recently conducted large U.S. and global surveys on this phenomenon, says the right approach is to instead carefully consider what we regret and why so that we can either reverse course or make better decisions in the future, as well as putting them behind us. Whether you're frustrated by bad career moves you've made, business ideas you didn't pursue, or relationships you've let falter, these regrets can be useful tools for personal growth. Pink's new book is “The Power of Regret: How Looking Backward Moves Us Forward.”