The Hardest Thing to Find in the Universe Is Even Rarer Than You Think

Staring at the periodic table of elements was pretty much all I did in science classes but I learned absolutely nothing from it other than Bromine and Barium (but that's more because of a Google search on Breaking Bad). Anyways! Elements on that periodic table aren't all created equal. Especially Astatine (At). That's pretty much the hardest thing to find anywhere.