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First built by the US National Aeronautics and Space Administration (Nasa) as one of three tracking stations for its space programme, the Hartebeesthoek Radio Astronomy Observatory (HartRAO) celebrates its 50th anniversary this month. At 26m

Near-field communication, or NFC, is taking the mobile world by storm, with operators and payments companies predicting it will change the way people buy and sell goods, potentially replacing plastic cards and cash at the point of sale