I don’t know who first thought Pi Day, a day to celebrate the world’s most famous number (3.14159265359…) should also be a day to discuss the edible pie, but I want to thank her. There are many similarities between the pi and pie, besides the name. Pi can be complicated and intimidating; so can pie. Both rely heavily on an understanding of math and geometry, and both can actually help you understand something about the world if you take a little time to study them. Both are the subject of myth.

But only one is truly delicious. (There is a longstanding debate here at National Geographic about pie v. cake. And the cake people are wrong.)

Now, pie was probably not always delicious. It