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Demonstration of droplet motions. a) A droplet moves in a square‐shaped path. b) A droplet moves through a narrow slit and has reversible shape changes. c) A droplet moves across a surface with small bumps. d) Five droplets move in the same direction in a synchronized manner. e) A droplet moves in oil while dodging obstacles. f) A droplet moves across a gap formed by two overlaid glass slides, and delivers a flexible device to the PCB board underneath it
