Intuitive Logarithmic Counting

http://www.huffingtonpost.com/ben-thomas/whats-halfway-between-1-and-9-kids-and-scientists-say-3_b_1982920.html?ncid=edlinkusaolp00000003&ir=Denver

Hexaflexagon Safety :)

http://www.youtube.com/watch?v=AmN0YyaTD60&feature=em-uploademail-new

Secret Agent Math

http://mathdude.quickanddirtytips.com/how-to-use-math-to-send-encrypted-messages.aspx?WT.mc_id=11039

More Hexaflexagons

http://www.youtube.com/watch?v=paQ10POrZh8&feature=em-uploademail-new
Vihart video Hexaflexagons 2

Hexaflexagon celebration Website:  http://www.puzzles.com/hexaflexagon/

Previous Years:  http://www.puzzles.com/hexaflexagon/aroundtheworld.html

Martin Gardner's post on Hexaflexagons 1956:  http://www.puzzles.com/hexaflexagon/aroundtheworld.html

Vihart Hexaflexagons

http://www.youtube.com/watch?v=VIVIegSt81k&feature=em-uploademail-new