Liquid metal imbalance of the surface tension induces a pressure difference between the rear and the head, which produces a thrust to drive the droplet toward the head; at the same time, the hydrogen produced in the electrochemical reaction process also further raises the thrust. The discovery of this phenomenon laid the technical foundation for the development of intelligent motors, vascular robots, fluid pumping systems, flexible actuators and even more complex liquid metal robots. Liquid metal Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be
The Common Law Origins of the Infield Fly Rule infield fly rule, the article turned to its legal analogy. Stevens argued that the infield fly rule "emerged from the interplay of four factors, each of which closely resembles a major force in the development of the common law." Stevens concluded his article by comparing the "dynamics of the common law" and the development of "one of the most important technical rules of baseball." Both, he argued, were "essentially conservative," creating change only when a problem arose and only to the extent needed. The article ended: "Although problems are solved very slowly when this attitude prevails, the solutions that are