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This video features Edmund Harriss from University of Arkansas.

Extra footage from this interview:    • Heesch Numbers (extra footage)  Numb...  

Heesch's Tiling Problem by Casey Mann: http://faculty.washington.edu/cemann/...

Check out the Numberphile Podcast: https://www.numberphile.com/podcast/

Penrose Tiling:    • 5 and Penrose Tiling  Numberphile  

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Most editing and animation in this video by Pete McPartlan
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There's an error in the heesch number 5 diagram, the topmost yellow tile should be green, so that the ring of green tiles completely enclosed the yellow ring.