NEW DELHI, June 15 (Xinhua) -- Seven people, including two children, the pilot and four male passengers, were dead in the private chopper crash in India's northern hilly state of Uttarakhand early on ...

HEFEI, June 13 (Xinhua) -- Chinese researchers have achieved a major breakthrough in extending the lifespan of perovskite light-emitting diodes (LEDs), according to the University of Science and ...