Superfluidity

When some fluids (for example liquid helium) are cooled to very low temperatures, strange effects occur: Suddenly, the fluid can move without friction, can pass through capillaries so tiny that no other fluid is able to run through, or it can even leak out of a half-filled bucket. Because of these superb properties, such fluids are called superfluids.

Superfluidity was first discovered by Kapitza and Allen and Misener in 1938. For explaining the quantum nature of this phenomenon, Lev Landau was awarded the Nobel Price in 1962. 

When browsing the web I found the following series of videos (produced in the 1960s). They very nicely show the truly amazing properties of superfluid Helium. So watch and be ...flabbergasted... (always wanted to use this word :-)