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...But Big Data also poses serious risks if it is misused or abused. Already, major innovations such as Internet search engines, machine translation and image labelling have relied on applying machine-learning techniques to vast data sets. And, in the near-future, Big Data could significantly improve government policymaking, social welfare programmes, and scholarship. But having more data is no substitute for high-quality data. For example, a recent article in Nature reports that election pollsters in the US are struggling to obtain representative samples of the population, because they are legally permitted to call only landline telephones, whereas Americans increasingly rely on cellphones. And while one can find countless political opinions on social media, these aren’t reliably representative of voters either. ...Live Mint on Feb. 10, 2017, 4:28 a.m.