Happiness: Good for creativity; bad for focus

Happy people are open to all sorts of ideas, some of which can be distracting.
http://www.scientificamerican.com/article.cfm?id=happiness-good-for-creati

7 rules for making more happiness

Using simple, delightful illustrations, designer Stefan Sagmeister shares his latest thinking on happiness -- both the conscious and unconscious kind. His seven rules for life and design happiness can (with some customizations) apply to everyone seeking more joy.
http://www.ted.com/talks/stefan_sagmeister_7_rules_for_making_more_happiness.html