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www.theatlantic.com A New Theory for the Staggering Sex Difference in Autoimmune Disease

About 65 million years ago, shortly after the time of the dinosaurs, a new critter popped up on the evolutionary scene. This “ scampering animal ,” as researchers described it, was likely small, ate bugs, and had a furry tail. It looked, according to artistic renderings , like an especially aggressive New York City rat. And it had a placenta, an organ that grows deep into the maternal body in order…