JERUSALEM, April 29 (Xinhua) -- Israeli researchers precisely measured ultra-powerful laser pulses that last only a few femtoseconds -- millionths of a billionth of a second, Ben-Gurion University ...

KUNMING, April 29 (Xinhua) -- Chinese scientists have achieved satellite laser ranging in the Earth-moon space in daytime for the first time in the world, despite the strong daylight interference, ...