Mathematicians invent tool to judge when voting maps have been unfairly drawn

In 1812, the governor of Massachusetts, Elbridge Gerry, approved a narrow and winding voting district for the state senate that curved from Marblehead around to Salisbury. It looked like a long-necked salamander, Federalist newspaper editors declared. They labeled the district “The Gerry-Mander,” and the Salem-Gazette warned that it was a “monster brought forth to swallow and devour your Liberties and equal Rights.”