Word: retinas
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...convent school, Leni learned to worship the orderly function of her organs, and the instruction had the force of an epiphany. Later she undertook her life's work: reproducing, with a child's paintbox and brush, "a cross section of one layer" of a nun's retina-6,000,000 cones and 100 million tiny rods...
...quite photojournalism after all. There is something missing from even the finest TV coverage: perspective, among other things, but the subjects of that prescient phrase, the "shadows in the jungle and on the moon," linger on the page long after they have left the screen or the retina...
Like so many other triumphs of science, the laser has become a double-edged sword. Capable of producing an enormously powerful, very narrow beam of light, it has been used to perform delicate surgery on the retina of the eye, puncture tiny holes in material as hard as diamonds, produce three-dimensional pictures called holograms, and even measure the distance from earth to the moon (with an error of only a few inches). But the laser can also be used for less peaceful purposes. It provides, for example, the guiding light for the Air Force's extremely accurate "smart...
...donned a molded plastic mask. At a signal, the accelerator beam was switched on, and nitrogen nuclei, traveling at almost the speed of light, flashed into his temple through a hole in the mask. At first nothing happened, even though the beam struck his optic nerve, behind the retina. For the next pulse, however, his head was moved so that the beam passed through his retina. "Hey, there's one!" he shouted. "Hey, there's a whole constellation...
...same flashes of light that astronauts see in space when their eyes are closed. Furthermore, he said, the experiment showed that atomic particles were causing the flashes -not through impact with the optic nerve or passage through the eye fluid, but by penetrating the retina itself...