From NBC's Pete Williams
Supreme Court Justice Ruth Bader Ginsburg returned to work today to the Supreme Court, taking her place at the bench as the court resumed hearing oral arguments.
A beaming Justice Ginsburg walked into the courtroom under her own power, 18 days after surgery for pancreatic cancer.
And during the oral argument, she was a frequent and energetic questioner -- all in all, her normal self.
She left the courtroom as she came in, on her own, without taking the arm of another justice.