A rendering of the excitatory neurons in a section of the sample. (Google Research & Lichtman Lab/Harvard University. Renderings by D. Berger/Harvard University) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A nanoscale project represents a giant leap forward in understanding the human brain. With more than 1.4 petabytes of electron microscopy imaging data, a team of scientists has reconstructed a teeny-tiny cubic segment of the human brain. It's just a millimeter on each side – but 57,000 cells, 150 million synapses, and 230 millimeters of ultrafine veins are all packed into that microscopic space. The work of almost a decade, it's the largest and most detailed...