Few moments in a scientific career are as satisfying as taking a problem that has puzzled and confused generations of predecessors and reducing it to a straightforward game or algorithm. I consider the complete solution of the confounding problem one of the main highlights of the Causal Revolution because it ended an era of confusion that has probably resulted in many wrong decisions in the past. It has been a quiet revolution, raging primarily in research laboratories and scientific meetings. Yet, armed with these new tools and insights, the scientific community is now tackling harder
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