Boing Boing on MSNOpinion
Two twisty doughnut shapes solve a 150-year-old geometry puzzle
In 1867, French mathematician Pierre Ossian Bonnet proved something that seemed like common sense: if you know how far apart ...
Just when you think that you have come across the most baffling optical illusion, the Internet dishes out another mind-boggling image. And adding to that list is a geometric optical illusion that may ...
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