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Michio Kaku: 3 types of Civilizations

An infrared image from NASA’s Spitzer Space Telescope that shows hundreds of thousands of stars crowded into the swirling core of our spiral Milky Way galaxy. Credit: NASA/JPL-Caltech/S. Stolovy (SSC/Caltech)

Michio Kaku describes 3 types of Civilizations. Kaku is an American theoretical physicist, the Henry Semat Professor of Theoretical Physics in the City College of New York of City University of New York. He has written several books about physics and related topics; he has made frequent appearances on radio, television, and film; and he writes extensive online blogs and articles.