First, the team fired nano-size droplets of superfluid helium across a vacuum. Meanwhile, they aimed a free-electron laser across the vacuum so that the laser would intercept the drops and take images of the drops as they went spinning past. Those images revealed that the droplets each contained more than 100 quantum vortices -- tiny whirlpools that fill the droplets in a 3-D array. The vortices help maintain the structure of the droplets so that even when they're spinning at speeds that would cause normal liquid drops to fly apart, they remain stable, single droplets. That said, the high spinning speeds of the drops did make many of them take on an egg shape, instead of a spherical one. One percent of the drops even took on strange wheel shapes.