Surround yourself with other people who are happy!
No longer just a saying, science demonstrated this:
Psychologists have long known that feelings can be contagious over short time frames or that people reflexively return smiles. But the new social network analysis showed that that contagious effect extends three "degrees" - as far as a friend of a friend of a friend - and drops off with time and distance.
So, a smile goes a long way!
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