Cryogenics

When certain materials are cooled below a critical temperature, they become superconductors, meaning they conduct electricity with zero resistance. A remarkable effect of this is the Meissner effect, where they expel magnetic fields, causing magnets to levitate stably above them without physical contact.

When helium is cooled to near absolute zero, it loses all viscosity and friction, allowing it to flow without resistance. This bizarre quantum state enables it to defy gravity by forming a thin film that creeps up and over container walls, a phenomenon known as the Rollin film effect.