National Geographic : 2014 Feb
intimate view Two hundred sections of a piece of mouse brain, each less than 1/1,000 the thickness of a human hair, are readied to be imaged by an electron microscope. Arranged in stacks, 10,000 such photomicrographs form a 3-D model no larger than a grain of salt (in tweezers). A human brain visualized at this level of detail would require an amount of data equal to all the written material in all the libraries of the world. a voyage into the Thought, feeling, sense, action—all derive from unimaginably complex interactions among billions of nerve cells. A section of mouse brain (above) no larger than a grain of salt serves as a window into this hidden world.