Every type of liquid has its unique properties. Water and mayonnaise, for instance, don’t flow the same and behave differently when compressed. But what if you had a single fluid that can change its properties on demand depending on the application? This is exactly what scientists at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) were able to do. They’ve devised a first-of-its-kind programmable metafluid, marking a significant leap forward in materials science. This metafluid can change its viscosity, springiness, and even the way it reflects light on command. Th…