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'Only One Conclusion': Radical Study Suggests Life on Earth Arose Twice

The fact that you, or I, or any living creature, is here at all is a series of astonishing strokes of luck stretching back more than 4 billion years.  One of the biggest hurdles was the very first one: How did life emerge from a primordial soup of stuff that very much wasn't alive? A radical new study, published in Science Advances, suggests that this unlikely threshold may actually have been crossed not once, but twice.

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