Rapid-talking
recreational mathematician Vi Hart has declared October to be
Flexagon Month.If you don't know what a flexagon is, take a peek at Hart's YouTube video about this geometric marvel. Even if you DO know what a flexagon is, the Vi Hart video is really, really cool! There's no better way to kick off Flexagon Month!
Basically, a flexagon is made from a folded strip of paper; it can be
flexed so that it has more than the original two sides. It's a bit
like a mobius strip (only completely not). 
Flexagon.Net
has clearly labeled templates
for making flexagons, tips for folding, and other ideas to further
your exploration. 
You
should definitely check out Hart's other entertaining math videos. I
love her doodles and dots! Actually, I love her
everything!
Maybe
October should be Vi Hart month!
Also
on this date:
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