I can no longer see Wayne Aubertin, but I can still hear him: his legs thwacking through the underbrush, his labored breath. “Come on!” he yells at no one in particular. A few minutes later I emerge ...

Mason and Dixon were pioneers in bringing geodetic astronomy to the American colonies. Through the efforts of the Mason and Dixon Line Preservation Partnership, we can promote this scientific ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Could there be a more opportune moment for an authoritative book on the border crisis? No, not that border, and not today’s crisis, but the dispute that once raged over where Pennsylvania ended and ...