Vi Hart, a self-described “Recreational Mathemusician” has posted a series of videos on youtube where she tells you about cool mathematics via doodling. For example, here is one about the Sierpinski Fractal inside Pascal’s Triangle (which those of you who went to this Math Club know all about) and Ulam’s Spiral (which we’ve been meaning to post about for ages!):

Oh yeah, maybe we should have warned you that Vi’s videos are a doubleshot of mathematical espresso!

Another good video which Michael pointed out was this one:

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