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Kaku on asteroid threat: "We are sitting ducks"

Michio Kaku, physics professor at the City College of New York and a "CBS This Morning" contributor, discusses the threat from space from small asteroids, and what he says the worl... More Michio Kaku, physics professor at the City College of New York and a "CBS This Morning" contributor, discusses the threat from space from small asteroids, and what he says the world needs -- and costs "chump change" -- to help safeguard our skies. Less

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