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"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."
Charles H. Duell was the commissioner of the United States Patent and Trademark Office in 1899 and is famous for purportedly saying "Everything that can be invented has been invented." However, this has been debunked as apocryphal by librarian Samuel Sass.