Engineers have crossed a symbolic barrier with a new way to make microchips with transistors that are a thousand times smaller than the width of a human hair or as small as a flu virus. The 90-nanometre width is regarded as a major milestone because scientists believe it will eventually lead to the production of transistors with atomic level dimensions.
Thousands of computers around the world have joined the search for extra-terrestrial life through a screensaver. But scientists are now wondering what we should say if ET happened to phone us.