South Korea's sound barrier-chasing train, and more in the week that was
 

Tesla's Gigafactory is spitting out lithium-ion batteries at breakneck pace, but the automaker isn't stopping there. Elon Musk just announced plans to give the factory a $350 million upgrade so that it can manufacture electric motors and gearboxes fo...

https://www.engadget.com/2017/01/22/...week-in-green/