Remember the graph paper you used at school, the kind that’s covered with tiny squares? It’s the perfect illustration of what mathematicians call a “periodic tiling of space”, with shapes covering an ...
In a 1997 episode of “Seinfeld,” a character named Kurt learns to his dismay that he is going bald. His dismay doesn’t stem from his aversion to being hairless; in fact, he is a swimmer, and is used ...
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