08/27/2012 10:24 am ET Updated Dec 06, 2017

WATCH: Where Does Happiness Come From? From Gretchen Rubin

When Gretchen Rubin, author of "The Happiness Project" and "Happier at Home," met with me on Mondays With Marlo, she tackled the elusive question we've all asked at least once -- what is the key to happiness?

For more fantastic advice on lifting your mood, see Gretchen Rubin's tips on happiness:

Tips On Happiness From Gretchen Rubin

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