Gang Wang

The crystal of RbMn6Bi5 resembles a five-story building of manganese atoms, where the residents on each floor form a pentagon. At room temperature, the magnetic moments of the atoms fluctuate chaotically, like compass needles during a magnetic storm.

A tiny coin circles a heavy bowling ball. The coin is a small black hole or a neutron star, and the ball is a supermassive black hole at the center of a galaxy.