Psychotherapist shares the No. 1 rule highly successful people follow to be happier at work: 'It's non-negotiable'

You can't always find happiness in the confines of a 9 to 5 job — but if you can find meaning in what you do, or at least learn to tolerate it, the benefits are endless.

According to Wharton psychologist Adam Grant, employees who understand their work has a meaningful, positive impact on others are not just happier than those who don't; they're more productive, too.

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