“The Lichtman laboratory at Harvard University and the Connectomics at Google team are releasing the “H01” dataset and companion paper. H01 is a 1.4 petabyte volume of a small sample of human brain tissue.

The sample was imaged at nanoscale-resolution by serial section electron microscopy, reconstructed and annotated by automated computational techniques, and analyzed for preliminary insights into the structure of human cortex.”

http://h01-release.storage.googleapis.com/landing.html/landing.html