1. The Hague (31.5) | 2. Amsterdam (30.2) | 3. Bucharest (28.4) | 4. Rotterdam (27.2) | 5. Vienna (26.8) | Source: OpenSignal
After cellphone networks were knocked out by two hurricanes, residents can now access the web from the stratosphere. The service is powered by two helium balloons hovering 18 kilometers (11 miles) above land.
Mobile security and privacy are important - hacks and surveillance are on the rise. But with the two main phone makers, Apple and Samsung, on the slip, where to turn? Well, you could try joining the Silent Circle.
Air pollution is a problem in all the world’s cities. In Europe, citizen scientists are being called in to help to monitor it. A project known as iSPEX-EU recruited people across the continent to measure air pollution using their smart phones. Suzanna Koster reports from Leiden in the Netherlands.
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