Hexaflexagons
youtube.com
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Vi Hart, who produces these videos, now works at Khan Academy. She's also one of the people to make tau (as an alternative to pi) go viral. http://www.youtube.com/watch?v=jG7vhMMXagQ
Vi Hart, who produces these videos, now works at Khan Academy. She's also one of the people to make tau (as an alternative to pi) go viral. http://www.youtube.com/watch?v=jG7vhMMXagQ