What it is: Math geeks, eat your heart out…Brown Sharpie is for you!  I found Brown Sharpie by accident today as I was perusing the app store in iTunes.  Brown Sharpie is a collection of “mathematical cartoons inspired by sharpie fumes” drawn by Courtney Gibbons.  Gibbons is an aspiring mathematician and the cartoons were created as she completed her undergraduate and graduate degree.  Many of the cartoons reference higher math and may be too complex to use in the k-8 classroom.  There are a few here and there that could be used with younger students with a little explanation.  High…