To avoid people thinking you're stupid, above all you need to refrain from undertaking risky tasks for which you lack suitable knowledge or skills. That's according to new research published in the journal Intelligence, which is the first to investigate the behaviours that people consider stupid.

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To avoid people thinking you're stupid, above all you need to refrain from undertaking risky tasks for which you lack suitable knowledge or skills. That's according to new research published in the journal Intelligence, which is the first to investigate the behaviours that people consider stupid.