Vi Hart with a quick lesson on Hexaflexagons, paper folded geometrically such that it bends the mind. If this were the 17th century, she'd be burned at the stake.
And check out the innards of peoples' libraries at Share Your Shelf, a Tumblr for bookshelf voyeurs.
"Cherish that which is within you, and shut off that which is without; for much knowledge is a curse." - Zhuangzi
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