If you’ve ever traveled abroad or heard a story about a cold blast or a heat wave hitting another country, you've likely heard the temperature in degrees Celsius. A hot day would be close to 40 ...

Oh, America. You do so confuse the rest of the world, with your “pounds per square inch” and “cups”, instead of sensible measurements like Pascals and liters. And part and parcel of that is your ...

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, ...