Past Insider on Instagram: "The mystery of Pi ($\pi$) fascinated thinkers for thousands of years before it was finally "tamed" by mathematics. While ancient civilizations used approximations like $3$ or $22/7$ for construction and astronomy, they couldn't explain why the number never seemed to "end." It wasn't until 1761 that Johann Lambert proved $\pi$ is truly irrational, meaning its digits never settle into a repeating pattern. follow @PastInsider for more But $\pi$ is even weirder than just