Missiles targeted at US cities and intercepted by President Bush's proposed missile defence shield could fall on Europe, Canada or middle America instead, arms researchers warn.
The cosmic speed limit - the speed of light - may have reduced as the Universe matured. New research seems to confirm hints that one fundamental constant, and possibly the speed of light as well, has changed slightly over time.
Delicate quantum states can be shielded from destructive noise, say physicists, bringing quantum computers a step closer.