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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.… - Lawrence M. Krauss
" "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. — DONALD RUMSFELD
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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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Additional quotes by Lawrence M. Krauss
Now, since the time of Newton there had been a debate about whether light was a wave---that is, a traveling disturbance in some background medium---or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave.
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