For something completely different, check out this video by fast-talking YouTube mathematics maven Vi Hart. In a scant four minutes, she presents the fascinating hexaflexagon. Flexagons were discovered in the 1930s, according to io9.com, which presents "entertainment, science, and futuristic culture for people who want to escape the everyday." If you thought Moebius strips were cool, wait until you see the folding, pinching and rotating that goes into creating a hexaflexagon.
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