Si eres feliz u optimista, no (necesariamente) eres estúpido

Al menos según la Harvard Business Review:
""Happy people are not the smart people."
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For instance, dopamine, a neurochemical released by our body which helps us experience enjoyment and happiness, has an ancillary benefit: it activates the learning centers of the brain, allowing our brains to become intellectual sponges.
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In fact, happiness is the single greatest competitive advantage in the modern economy. Only 25% of your job successes are predicted based upon intelligence and technical skills, though we spend most of our education and most companies hire based upon this category. The "silent 75%" of long-term job success is based upon your ability to positively adapt to the world: optimism, social support creation, and viewing stress as a challenge instead of as a threat.
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If you want to see what your brain is capable of today at work or school, try to raise your level of happiness before tackling a challenge. …"

Pues ya sabes, sonría, ríe y disfruta de la vida para vivir mejor.
Algunas ideas para ser más feliz? En el artículo citan Good Think Inc.