Arnold Palmer has what I call an 'Eisenhower smile'. Those two men they'd smile and their whole faces would look so pleasant it was like they were smiling all over.
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Even if you're unhappy just pretend that you're happy. Eventually your smile will be contagious to yourself. I had to learn that. I used to think 'I'm being fake ' but you know what? Better to be fake and happy than real and miserable.