An energetic Mick Jagger skipped, spun, sprinted and pranced Friday night as the Rolling Stones launched their North American tour at Chicago's Soldier Field. The 75-year-old showed no sign of ill health three months after the tour was postponed because a doctor said he required medical treatment. By all visible indications: Jagger was Jagger. Before a sold-out crowd of around 60,000 at the Chicago Bears home stadium, the band's finger-wagging frontman opened with "Street Fighting Man," running from the stage in the end zone area and down a narrow stage jutting into the crowd on what is normally the 30-yard...