> Liquid helium is also a superfluid, meaning it flows without viscosity. No. At least not at temperatures > 2.17 K, which is where the phase change occurs. In

> Liquid helium is also a superfluid, meaning it flows without viscosity. No. At least not at temperatures > 2.17 K, which is where the phase change occurs. In the range (2.17..4]K, He is just a regular liquid; it is only superfluid in the range (0..2.17]K. Hard to trust anything in the article when it gets something that fundamental that wrong.