In 2016, Oxford Dictionaries declared “post-truth” the word of the year, and many have since embraced the idea that we are living in a post-truth era. But Morgan Marietta, a political scientist at UMass Lowell and co-author of One Nation, Two Realities , says it’s not truth that’s disappeared. It’s a shared perception of facts and reality that’s declined in recent years. “Reality is still there. Truth is there, if we can get to it,” Marietta said. “Facts, unfortunately, are social approximations