It's no shocker that Harry and Hermione would know that 4 — 1 = 3. But what if I told you that this Harry and Hermione aren't characters in Harry Potter stories — they're stingrays. And they can still ...

A new 13-sided shape is the first example of an elusive "einstein" — a single shape that can be tiled infinitely without repeating a pattern. When you purchase through links on our site, we may earn ...

And it all began with a hobbyist “messing about and experimenting with shapes.” An “aperiodic monotile,” or einstein, is a shape that tiles an infinite flat surface in a nonrepeating pattern. The ...