How do solar cells work?
Bangalore, India, has enjoyed massive economic growth and accompanying population explosion, but there's also a dark side - uncontrolled pollution of the city's surrounding lakes from industrial effluent and untreated sewage. The latest problem: a lake spewing masses of toxic foam.
Erfurt, Wittenberg, Eisenach: Discover important way-stations in the Protestant reformer's life.
Intellectual property (IP) is back in focus after US President Trump asked his trade office to look into the issue of China allegedly stealing American technology and IP, and eroding US firms' competitive edge.
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