Matt Parker discusses the forgotten flexagon... Extra footage at:    • Forgotten Flexagon (extra) - Numberphile  
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More Matt Parker (video playlist): http://bit.ly/Matt_Videos

Catch Matt on the Numberphile podcast too: https://www.numberphile.com/podcast

Vihart's famed flexagon video:    • Hexaflexagons  

Matt's own website, with links to all his stuff, is at: http://standupmaths.com

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Videos by Brady Haran
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