The US might have to delay plans to shoot down a defunct spy satellite on Thursday because of bad weather. Waves in the Pacific are too big for US warships to get into a correct position to fire a missile at the spacecraft.
A laser developed for military use is a few steps away from hitting a power threshold thought necessary to turn it into a battlefield weapon. The Solid State Heat Capacity Laser (SSHCL) has achieved 67 kilowatts (kW) of average power in the laboratory.
The scientist many regard as the father of nanotechnology has backed away from his famous claim that nanomachines could turn the planet into "grey goo".
Physicists say they have brought light to a complete halt for a fraction of a second and then sent it on its way. Controlling the movement of light particles - so-called photons - to store and process data could lead to the development of quantum computers.