Hexaflexagons
youtube.comVi 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