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We're an inquisitive lot, we humans. But could our inquisitiveness ultimately kill us?

In a new Discovery Channel documentary "Into the Universe with Stephen Hawking," the world's most recognized physicist speculates about different forms of alien life and explores efforts under way to search and communicate with intelligent extraterrestrial civilizations. However, he cautions that perhaps we shouldn't be advertising our location; perhaps we should just sit back and listen instead.

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