Superfluid helium can flow upward, defying gravity entirely.

Added: 2026-05-27

[00:00:00]Superfluid helium can flow upward, defying gravity entirely. When cooled to temperatures near absolute zero, helium four transitions into a superfluid state with zero viscosity. Because it lacks any internal friction, it can creep up and over the walls of its container as a microscopic film. This allows it to effortlessly leak through microscopic pores that normally hold fluids or spontaneously fountain out of a container.