Hey guys! About 2300 years ago, an old dude with a beard (or possibly several old dudes with beards, there's still controversy over whether Euclid was one person or a whole team) published the biggest mathematical blockbuster ever written: a journal/textbook consisting of 13 books that changed the face of human knowledge forever. It was a collection of axioms, postulates, and proofs that essentially created the subject of geometry and is still the main content of every geometry course taken in school. The old dude, Euclid, christened his book 'Elements'. Before we delve into the content of the book, let's spend a moment just grovelling over how the book almost literally created the subject of math. Besides from being one of the most published books ever (second only to the Bible), it was also a masterpiece in what we would now call logic. Elements was not entirely Euclid's creation, however. It was largely composed of proofs by earlier mathematicians and was a...