Does life exist anywhere else in the universe? And how did it get started? Scientists are seeking the answers in the cosmos, our solar system and right here on planet Earth.
This is the first video in our six-part series on unsolved mysteries in science. View the collection: http://www.economist.com/node/21660635
Read the accompanying article: http://www.economist.com/news/sciencebrief/21660515-first-series-six-briefs-looking-unsolved-scientific-mysteries-we-ask-how
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