Sungho Choi has criticised Michael Strevens’s counterexample to David Lewis’s final theory of “token” causation, causation as “influence.” I argue that, even if Choi’s points are correct, Strevens’s ...

Inside the symmetries of a crystal shape, a postdoctoral researcher has unearthed a counterexample to a basic conjecture about multiplicative inverses. “I’m nearly at the end of the talk, and it’s ...

In 1917, the Japanese mathematician Sōichi Kakeya posed what at first seemed like nothing more than a fun exercise in geometry. Lay an infinitely thin, inch-long needle on a flat surface, then rotate ...

This is a preview. Log in through your library . Abstract In 1985 Gabai gave a complete proof of the Simple Loop Conjecture, which states that any map between closed surfaces, which does not induce an ...

A new paper explores community-supported agriculture and its survival in the face of economic globalization. Organic food was once an economic haven for small farms who distributed their goods ...

The fundamental laws of physics insist that no patterns can permanently survive nature’s steady course towards disorder – or can they? A new proof offers a peculiar counterexample to the once-settled ...