"There are known knowns and known unknowns, but what we should be worried about most is the unknown unknowns."
"It's one thing to make lemonade out of lemons, another to proclaim that lemons are what you'd hope for in the first place."
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Source: Gary Marcus (2009). “Kluge: The Haphazard Evolution of the Human Mind”, p.38, Houghton Mifflin Harcourt
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