Explaining The Universe on Instagram: "The digits of π (pi) go on forever without repeating, which makes them seem random, but they’re not truly random since they follow a specific mathematical definition. Pi is called an irrational number because it can’t be written as a fraction, and it’s also believed to be normal, meaning every possible sequence of digits appears eventually with equal frequency—though this hasn’t been fully proven. To us, its digits look unpredictable, but they’re generated