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Sources:
WebMD: Happiness: 6 Myths and Truths
<http://www.webmd.com/balance/features/happiness-6-myths-and-truth>
WebMD: The Truth About Tryptophan
<http://www.webmd.com/food-recipes/features/the-truth-about-tryptophan>
WebMD: Can Money Buy Happiness?
<http://www.webmd.com/balance/news/20100701/can-money-buy-happiness>
WebMD: Study: Happiness Good for the Heart
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WebMD: Southern States are the Happiest
<http://www.webmd.com/balance/news/20091217/southern-states-are-the-happiest>
WebMD: People Happier, Less Stressed After Middle Age
<http://www.webmd.com/balance/news/20100518/people-happier-less-stressed-after-middle-age>
WebMD: Sex Better Than Money for Happiness
<http://www.medicinenet.com/script/main/art.asp?articlekey=50307>
WebMD: Music Therapy - Topic Overview
<http://www.webmd.com/balance/tc/music-therapy-topic-overview>
WebMD: Why You're Not Happy
<http://www.webmd.com/balance/features/why-youre-not-happy>
MedTerms: Fear of Joy
WebMD: Give Your Body a Boost -- With Laughter
<http://women.webmd.com/guide/give-your-body-boost-with-laughter>
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