Unless you work in a soul-sucking environment with a bunch of glory hogging superiors who are constantly kicking you down, you will get several opportunities to showcase your intelligence during your careers.
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Sometimes these opportunities arise at logical places and times like a client meeting or maybe during a training session. It's also possible for these opportunities to arise at unexpected times like at a team lunch when you have broccoli stuck in your teeth or when you are forced pull an LBJ on a colleague because, well, these things happen.