Study math for long enough and you will likely have cursed Pythagoras's name, or said "praise be to Pythagoras" if you're a bit of a fan of triangles.
But while Pythagoras was an important historical figure in the development of mathematics, he did not figure out the equation most associated with him (a2 + b2 = c2). In fact, there is an ancient Babylonian tablet (by the catchy name of IM 67118) which uses the Pythagorean theorem to solve the length of a diagonal inside a rectangle. The tablet, likely used for teaching, dates from 1770 BCE – centuries before Pythagoras was born in around 570 BCE.
Everyone learns something new everyday. How often have you seen a TIL and thought, "doesn't everyone know that"
relevant xkcd
Someone here is seeing this xkcd for the first time just now…
This is my favourite xkcd
Edit: I gotta say it should be 380000 though, because it should be applied to the world instead of being US centric