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It's strange that we have to speculate about if life could have emerged on Mars, without really knowing for sure how it emerged on Earth.
by jonplackett 6y ago
It's strange that we have to speculate about if life could have emerged on Mars, without really knowing for sure how it emerged on Earth.
- michaelmrose 6y agoIt's hard to learn something about a class of things while only studying one example of that class.