Why Can't We See Evidence Of Alien Life

Given the vast number of planets in the universe, many much older than Earth, why haven't we yet seen obvious signs of alien life, or singularity fields? The potential answers to this question are numerous and intriguing, alarming and hopeful. This brilliant TEDEducation animated exploration of the famous Fermi Paradox is narrated by Chris Anderson. This animation is part of TED's new series, "Questions no one knows the answer to".

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