Castle Bravo-the prerecorded voice of Barney O’Keefe came over the loudspeaker, counting down the last seconds. Everyone fell silent. “Five. Four. Three. Two. One” Zero hour. A flash of thermonuclear radiation filled the air. The presence of x-rays made the unseen visible. In the flash of Teller light, Freedman-who was watching the scientists for the reactions-could see their facial bones. “In front of me…they were skeletons,” freedman recalls. Their faces no longer appeared to be human faces. Just “jawbones and eye sockets. Rows of teeth. Skulls.