Fed Chair Janet Yellen returns to Capitol Hill for a second day of testimony Thursday, and the bond market is likely to once more fight her every word. As Yellen testified before the House Financial Services Committee on Wednesday, Treasury yields fell. The spread between 10-year and two-year yields moved to the flattest it's been since December 2007 — at 99.40 basis points. The market has been moving in this direction, and it continued to do so as some in the bond market were disappointed that Yellen did not say...