The latest Numberphile video is about the Collatz Conjecture - in particular a new way of visualising it.
Inkthusiast Tiffany Arment did the coloring in!
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Here is extra interview footage that was not used in the main video.
And if you're feeling especially hard core, here's the full 63 minutes of Tiffany's coloring... It seemed a shame to not share it.
We have previously covered the Collatz Conjecture in more detail - here is the video with MSRI's Professor David Eisenbud.
And extras for that too...