Sao Paulo drought issue for global concern

He cast his rod happily here for 30 years—but where a river once teemed with fish, Brazilian fisherman Ernane da Silva these days stares out over a valley of weeds and bone dry, sun-parched land.

19 hours ago
5 / 5 (2) 0

Building a better battery

Imagine an electric car with the range of a Tesla Model S - 265 miles - but at one-fifth the $70,000 price of the luxury sedan. Or a battery able to provide many times more energy than today's technology ...

Nov 25, 2014
4.2 / 5 (43) 30