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Britain\u2019s prime minister has promised to step down if Parliament passes her deal with the European Union. That has sparked a leadership contest that seems likely only to complicate the mess. As an American county declares a state of emergency over its measles outbreak, we discuss anti-vaccine misinformation and examine its grave consequences. And, your formal grammar knowledge has little to do with your grammar skills; it\u2019s time to change how the subject is taught.