ABC News Says "'Darwin's Dilemma' May Be Solved": What, Again?

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An article at ABC News carries the bold headline, "'Darwin's Dilemma' May Be Solved." The story has generated some buzz over at RichardDawkins.net. The subject is a recent paper in Science, "Low Mid-Proterozoic atmospheric oxygen levels and the delayed rise of animals," which we've already covered at ENV . What is "Darwin's dilemma"? The ABC News article explains:

Biologists and geologists have been puzzled for decades over why life began so early on this planet, and then took so long to get...