A father's note, on 9/11

"84th floor / West Office / 12 people trapped. It is not these words alone that change the narrative of Randy Scott's final moments. The other content on the note is a dark spot, about the size of a thumbprint. It is Randy's blood, and the clue that eventually enabled the medical examiner's office to trace the source of the note through DNA tests and deliver it to his family a decade after he apparently tossed it from the 84th floor."