I have been around people who hit both ends of this spectrum. I have never been sure if it was a genetic trait or just the behaviours that they learned as they grew up.
I do know that they can be contagious. There have been several times at work where an always bitter person "poisoned" an entire workgroup. I also know a person right now who brings up the entire workgroup and everyone else who she works with.
Of course, when you have both types in the same workgroup anything might happen. Usually, the bitter person explodes all over everyone because the happy person drives them nuts.
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If love is blind, why is lingerie so popular?
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