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Dr. Michael Lemole, left, chief of neurosurgery, and Dr. Peter Rhee, trauma director, discuss Rep. Giffords' condition.
The bullet entered Giffords' head from the back, traveling through the left side of the brain, and exiting the front of her head.
President Obama and the First Lady observe a moment of silence.
Members and staffers of Congress stand in a moment of silence on the steps of the Capitol.
A Capitol police officer outside Rep. Giffords' office.
Wall Street also observed a moment of silence.