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Ignorance isn't just bliss, it's key to expanding your knowledge

Jamie Holmes, a fellow at the Washington, D.C.-based New America think tank and author of the forthcoming book "Nonsense: the Power of Not Knowing," cites a variety of fields where experts have, in recent years, begun fronting the study of what we don't know as central to understanding what we do.

"The more we know, the more we can ask," Holmes writes, "Questions don’t give way to answers so much as the two proliferate together. Answers breed questions. Curiosity isn’t merely a static disposition but rather a passion of the mind that is ceaselessly earned and nurtured."