Superfluid prediction kicks up a storm
Boundary layers are conventionally associated with viscosity, and were not expected to arise in superfluids. Modelling superfluid helium flowing over a surface with nano-scale roughness, typical of real surfaces, has shown the formation of a quantum boundary layer, consisting of a tightly knitted layer of quantum vortices. These findings are published in Physical Review Letters and featured in Physics. You can also see a short clip of the results here.