Robot vehicles are increasingly taking a role on the battlefield - but their deployment raises moral and philosophical as well as technical questions.
Mathematicians claim to have worked out how to make a cloaking device to render objects invisible.
The Iranian government has been successfully scouring Europe for the sophisticated equipment needed to develop a nuclear bomb, according to the latest western intelligence assessment of the country's weapons programmes.
The European Space Agency has successfully launched the first satellite in its Galileo project, a direct rival to the U.S. monopoly on space-based global positioning services.
A review of the political and technical challenges faced by the International Thermonuclear Experimental Reactor (ITER) as it faces a decisive stage in its future.
The myriad benefits promised by the launch of new positioning systems are opening up a future where we need never lose our way - or our mobile phones - and where our movements may be tracked around the clock by a "spy-in-the-sky".
The United States is embarking on a multimillion-dollar expansion of its nuclear arsenal, prompting fears it may lead the world into a new arms race. The Bush administration is pushing ahead with the development of a new generation of weapons, dubbed 'mini-nukes', that use nuclear warheads to penetrate underground bunkers.
Saudi Arabia, in response to the current upheaval in the Middle East, has embarked on a strategic review that includes acquiring nuclear weapons, according to the Guardian.
Scientists and engineers at a NASA conference in Santa Fe discuss plans to develop a space elevator that would deliver satellites, spacecraft and even people thousands of kilometres into space along a vertical track.
Jeremy Rifkin proposes setting up a decentralized energy system, similar to the internet, to reduce vulnerability to blackouts.