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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