Science says being grateful for the whole year can greatly improve your life. Studies show that expressing gratitude can activate the reward center of the brain and help people connect. Researchers say that gratitude is more than just a feeling, it can become a personality trait. It can help people be happier. Jennifer Wallace, a freelance contributor to the Wall Street Journal, joins "CBS This Morning" to discuss the science of gratitude and how to cultivate the trait in children.
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