Are the ever-increasing number of home runs a consequence of steroids? Not entirely, suggests Wall Street Journal's Jared Diamond, who reveals that the secret behind the long ball is right in front of our noses: the swing. Diamond tracks a group of baseball's biggest stars—including Aaron Judge, J.D. Martinez, and Justin Turner—who remade their swings under the tutelage of renegade coaches whose ranks include a swimming pool contractor, the owner of a billiards hall, and an ex-hippie inspired by the Japanese samurai.