Once limited to small, artisanal producers, high-proof tequilas are now embraced by bigger brands and consumers alike.

Proof complexity investigates the inherent difficulty of demonstrating that a given propositional formula is unsatisfiable. By analysing measures such as proof length, size, width and degree across ...

Mathematicians spend most of their time thinking about what’s knowable. But the unknowable can be just as compelling. Perhaps the most famous example comes from a theorem by the logician Kurt Gödel.