As we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – the ones we don't know we don't know.

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Albert Einstein • Milton Glaser • Guy de Maupassant • Henry David Thoreau • Friedrich Nietzsche • Confucius • Voltaire • Zig Ziglar • Kurt D. Cobain • Elwyn Brooks White • Anna Eleanor Roosevelt • anonymous • Mike Monteiro • Miguel de Cervantes Saavedra • Martin Luther King Jr. • John Maeda • Steven Wright • Theodor Seuss Geisel • Marshall McLuhan • Rabindranath Tagore • Pablo Picasso • Winston Churchill • Toni Morrison • Annie Proulx

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