There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don’t know.… - Lawrence M. Krauss

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There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don’t know. But there are also unknown unknowns. There are things we don’t know we don’t know.

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About Lawrence M. Krauss

Lawrence Maxwell Krauss (born May 27, 1954) is an American theoretical physicist and cosmologist who is professor of physics, Foundation Professor of the School of Earth and Space Exploration, and director of the Origins Project at the Arizona State University. He is the author of several bestselling books, including The Physics of Star Trek.

Biography information from Wikiquote

Also Known As

Native Name: Lawrence Maxwell Krauss
Alternative Names: Lawrence Krauss Larry Krauss
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More often than you might think, teaching science is inseparable from teaching doubt.

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