9/11: As the decades pass, the act of remembering evolves

Remembering is not merely a state of mind. As those who beseech us to never forget the Holocaust have long insisted, it is an act. And when loss and trauma are visited upon human beings, the act of remembering takes many forms.

Across the vast field where the plane fell out of the sky so many years ago, all is quiet. The hills around Shanksville seem to swallow sound. The plateau that Americans by the millions ascend to visit the Flight 93 National Memorial, to think of those who died in this southwestern Pennsylvania expanse, sits just above much of the landscape, creating a pocket of quiet precisely where quiet needs to be.