Not quite what the article is about, but I just re-read Robots and empire by Asimov and the idea that natural radiation in the crust from the theia impact (chu

Not quite what the article is about, but I just re-read Robots and empire by Asimov and the idea that natural radiation in the crust from the theia impact (churn heavy elements out of core) is a cause of the degree of biodiversity on earth is core to the story.