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 ...

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The first few years of school weren’t easy for RuoHan Chen. He had emigrated from China at age 4, just a few years before starting kindergarten. The language and culture were still new to him, which ...

Frank A. Farris does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

If you buy something using links in our stories, we may earn a commission. Learn more. A few minutes into a 2018 talk at the University of Michigan, Ian Tobasco picked up a large piece of paper and ...