Reports hinted at possible sightings, but nobody had directly measured the electron energies in a real crystal to confirm this fractal. It looked like a problem best left to speculation. Now, however, ...

A fractal butterfly pattern produced by an unusual configuration of magnetic fields, first predicted almost 50 years ago, has been seen in detail for the first time in a twisted piece of graphene.

So you saw a fun GIF on X, formerly known as Twitter. That's cool, good for you, seems like fun. Now you want to save it for your own personal use. That's cool, too, but unfortunately a bit more ...