The TES survey found that seven of the 21 tasks were still being carried out by teachers.

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Mapping the modern distribution of these superclusters is one of the tasks of the Sloan Digital Sky Survey (another foundation-funded instrument, based in New Mexico), which is scanning a quarter of the sky in unprecedented detail.

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The average user in the survey reported using their phone eight times a day for tasks requiring connectivity.

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Mr Stratton draws on data from the 2000-01 Time Use Survey in Britain, which shows how people spent their day and which tasks they enjoyed.

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