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 Ass in the Lion's Skin the lion's skin was one of several fables by Aesop that was put to use by cartoonist Thomas Nast when it was rumoured in 1874 that the Republican President Ulysses S. Grant would attempt to run for an unprecedented third term in two years' time. Around that time, there was also a false report that the animals had escaped from Central Park Zoo and were roaming the city. Nast combined the two items in a cartoon for the 7 November "Harpers Weekly"; titled "Third Term Panic", it depicts a donkey in a lion's skin (labelled Caesarism) scattering animals that stand