Watch a 'heart' made from liquid gallium beat in an electric field

New Scientist 

Gallium droplets beat like tiny hearts when activated by electricity and could one day be used to power robot muscles. Xiaolin Wang at the University of Wollongong and his colleagues demonstrated this heartbeat effect by placing a drop of liquid gallium inside a circular electrode. In their video, the gallium droplet initial rests against one side of the electrode, which is tipped at a slight angle. When an electric current is applied, the gallium starts reacting with the surrounding water to form gallium oxide. Because gallium oxide has less surface tension than gallium, the spherical droplet starts to spread out like a pancake.

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