How Tiny Swimmers Put the "Super" in Superfluid

For Superman and Supergirl, it's alien DNA. For Spiderman, it's the bite. For Iron Man, it's the suit. But for some "superfluids," it's the tiny, self-propelled swimmers that are the source of their power. Self-propelled bodies can decrease the viscosity of a fluid to zero through theirrandom diffusion and spreading process. Image Credit: Sho Takatori and John Brady / APS. Consider two cups, one filled with water and one filled with honey. Turn them upside down at the same time and it's no surpr...