In order to celebrate Pi Day, we TED-Ed nerds are bringing you 3 fun facts about our favorite irrational number!
1. Pi is infinite! To write it out, you’d begin with 3.14159 and continue on….forever! That’s why, instead of trying to write out an infinite number of digits every time, we just refer to it using the Greek letter, Pi.
2. Pi is an irrational number, or a number that can never be expressed as a ratio of 2 whole numbers.
3. Scientists have used Pi to calculate the density of our entire universe, which has infinitely less stuff in it than the total number of digits in Pi.
By looking for regular patterns of sound changes between languages, linguists can begin to determine relationships, trace specific steps in their evolution and even reconstruct earlier languages with no written records.
Over the course of human history, thousands of languages have developed from what was once a much smaller number, as people that shared the same language and culture split into smaller tribes. Centuries of living in different conditions, eating different food, and encountering different neighbors turned similar dialects with varied pronunciation and vocabulary into radically different languages, continuing to divide as populations grew and spread out further.