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One could make a strong argument that the three scariest words to state aloud (particularly in the workplace) are these: I don’t know. That phrase is an explicit admission that we’re less than perfect. Our fear of stating “I don’t know� is amplified by the worries that we should know it, perhaps we once knew it but have since forgotten, and that everyone else knows it.

There are two alternative approaches to saying “I don’t know.� The first is to remain silent. You might look away and hide yo...