The same researchers behind the 13-sided "hat" shape have stumbled upon a version that improves upon the original in a very important way. Reading time 2 minutes In March, a group of mathematicians ...
It looks a little like a fedora, and it's what's known as an "Einstein tile." Meaning, unlike other shapes, if it's laid out and slotted together over and over again, it doesn't easily repeat itself.
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