Happy Pi Day! A favorite holiday among geeks, March 14 commemorates one of the most fundamental and strange numbers in mathematics. It's also Albert Einstein's birthday.
This is a great excuse to bake pies, as many iReporters have (send us your pie-report!). But there are also lots of reasons to celebrate this number: Pi appears in the search for other planets, in the way that DNA folds, in science at the world's most powerful particle collider, and in many other fields of science.