Almost a year ago, we first heard about Natalie Jeremijenko and her ferel robot dogs. Today, an Ithaca Journal article describes a recent visit by six of Natalie's ferel robot dogs to Washington Park, Ithaca, New York where they successfully sniffed out the source of some coal tar pollution. Because their primary goal is educating the public about pollution hazards, Natalie has taken to calling the robots "weapons of mass instruction". She hopes to make the plans simple enough that any high school student can download the information, upgrade their existing robot dog, and start sniffing out pollution in their neighborhood.