Lisa Randall - Why is Quantum Gravity Key?

Quantum theory explains the microworld. General relativity, discovered by Einstein, explains gravity and the structure of the universe. The problem is that the two are not friends; they do not get along, they are not compatible. But they must. That's the task of quantum gravity.
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Lisa Randall is an American theoretical physicist and a leading expert on particle physics and cosmology. She is currently a Frank B. Baird, Jr., Professor of Science at Harvard University.
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