Davidson is also the discoverer and curator of the "Silicon Zoo," a collection of infinitesimal drawings etched directly into the circuitry of mass-manufactured microprocessors by their designers, and running the gamut in shape and style from a 2mm-long Crayola crayon to a Waldo one-third the width of a human hair. It's like tiny graffiti for nerds (regular nerds, not graffiti nerds).