Two of the most intriguing questions in science are: How did life on Earth begin? and Is there life elsewhere in the universe?
Given the enormous interest in these questions, you might expect that the basic concepts would be settled by now. But in fact, many ideas about crucial aspects of life are plagued with uncertainties and misconceptions. Before we can even crudely estimate the likelihood of life beyond Earth, we need to know a lot more about how life on Earth got started.
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