“And this was no observation by a mere human, who might delude himself. This was a report from complex electronic devices. It was images formed on phosphors coated on radar screen tubes, excited by accelerated electrons whose pattern of impact was governed by echoes from the original of the image. Phosphors do not imagine. Electrons are not affected by panic. As a radar image it was a faithful report—in its own terms, without interpretation—of something that actually was.”