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PLAY INTERPERSONAL PING-PONG
If you serve up a smile to people, they usually bounce it back. Hit them with a snarl and watch them scowl instead. Research shows that facial expressions and the moods that accompany them are contagious, probably because they evolved as a means of nonverbal communication between people. You can use the infectious effects of a grin to jump-start an optimistic outlook in yourself by sending others what you want them to lob back at you. A kind word to the man behind the deli counter can get your day bouncing in the right direction.