Anthropologist discovers "hobo graffiti" dating back almost a century

Anthropologist Susan Phillips had spent a career examining the graffiti that covers urban walls, bridges and freeway overpasses.

But when she came across an unrecognizable collection made not of spray paint but substances like grease pencil and apparently left there for a century, she was stunned.

Phillips had uncovered a peculiar, almost extinct form of American hieroglyphics known as hobo graffiti, the treasure trove discovered under a nondescript, 103-year-old bridge spanning the LA River. — NBC Los Angeles