Highlights of the Gadgets and Gizmos October 2017 issue: -  1 An air purifier is the need of the hour with the level of PM2.5 reaching alarming levels, even indoors. If you have been considering buying one, our cover story this issue will serve as a quick guide to make that essential purchase. Know what points to keep in mind before buying an air purifier – the different features, the filters, the best ones in the market today and the prices – and make an informed decision.   2 Having focused on multiple cores to boost performance in smartphones, chip manufacturers are now adding dedicated hardware to address the need for machine learning to handle tasks such as real-time voice processing and image recognition swiftly. With AI computing enabled on smartphone chipsets, users can expect a significantly better experience. We bring you all the details.   3 Buying a smartphone today is not an easy decision..being spoilt for choice has its downside! We bring you a tried-and-tested take on the Samsung Note 8, Nokia 8, and the Mi Mix 2. Unbiased, detailed reviews to help you make the tough choice.   4 Know more about the new launches: the most affordable Nokia smartphone – Nokia 2 – and Amazon’s smart speakers – Echo Plus, Echo and Echo Dot