Psychological studies have long shown that adults with a strong sense of self control tend to be happier and less anxious than those who describe themselves as undisciplined. Now new research is indicating that children who exhibit a strong sense of self control will grow up to find more success in the professional world than those who are impulsive. According to behavioral scientists, willpower is a finite resource: each of us only has so much. So how do we learn--and teach our kids--to say "no" to our impulses? Two recently published books, "Better Than Before: Mastering the Habits of Our Everyday Lives," by Gretchen Rubin, and "The Power of Habit: Why We Do What We Do in Life and Business," by Charles Duhigg, offer strategies. How do you cultivate willpower in yourself and others? Let us know in the comments.