Sixty-six and a half million years after a Tyrannosaurus rex crossed a North Dakota landscape, a high school science teacher knelt in the earth and found its footsteps waiting. Four massive impressions, spaced in a line, form what may be the first trackway ever documented from an adult T. Rex — a distinction that separates this find from all prior discoveries of isolated prints or juvenile paths. In the long human project of reconstructing life before memory, this is a rare moment: not just a fossil, but a record of motion, of a living creature moving through its world.