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Optimism promotes skill development
The happier you feel, the more open you are to new perspectives, opportunities and experiences. Therefore, you are more likely to learn something and acquire new skills and knowledge.

Think of the happy child in the schoolyard playing https://kasynoonlineautomaty.pl/automaty-do-gier/, socializing, running around with the ball. That child is developing physically, gaining athletic skills and social skills. The same can be applied to you and your workplace.