Every year on March 14th, the world celebrates Pi Day, recognising one of the most important constants in mathematics: π (pi). Pi represents the ratio of a circle’s circumference to its diameter. It might sound like something that belongs firmly in a maths textbook, but it actually plays an essential role in the engineering and design of modern technology — including the smartphones we use every day. So what’s the deal with pi? It’s the magical number that tells us how many times a circle’s diameter fits around its circumference. Sounds like a maths class nightmare, but hold onto your [...]