Hexaflexagons, A Fascinating Video by Mathemusician Vi Hart

Khan Academy fast-talking mathemusician Vi Hart has made Hexaflexagons, a fascinating video about the history and math behind six-sided flexagons (hexaflexagons) and how to make one of these flippable geometric pieces with a simple strip of paper. A second part video will be released soon by Hart.

Hexaflexagons