A more precise model of the Earth's ionosphere

The ionosphere—the region of geospace spanning from 60 to 1000 kilometers above the Earth—impairs the propagation of radio signals from global navigation satellite systems (GNSS) with its electrically charged particles. ...

How savvy shoppers undermined India's great cash swap

At 8:15 p.m. on November 8, 2016, India's Prime Minister Narendra Modi delivered a surprise address live on national television. He announced that, at midnight, all 500- and 1,000-rupee notes would cease to be legal tender. ...

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