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Colin Anderson Productions pty ltd/Getty Images People have been skipping – or skimming – stones for thousands of years, but physicists are continuing to learn more about the phenomenon. The latest insights suggest new techniques that could help bring spacecraft safely back to Earth. A team involving researchers from several Chinese universities made an experimental model of a skipping stone using an aluminium disc. The model contained electronic sensors to transmit details of its spin and movement to a computer via Bluetooth. Advertisement The aluminium disc was then launched towards a pool of water using a puff of air and a motor that gave it a precise rate of spin, which previous research has shown is key to getting a skip. A high-speed camera above and another positioned parallel to the water surface tracked the disc’s movement in two planes. ....