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Michio Kaku on "The Future of Humanity," Mars and space exploration

Colonizing Mars is just one of the topics in Michio Kaku's new book, "The Future of Humanity: Terraforming Mars, Interstellar Travel, Immortality, and Our Destiny Beyond Earth." Kaku, a CBS News science and futurist contributor who is also a physics professor at City University of New York, joins "CBS This Morning" to discuss man's future in space.
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