With two light barriers closely positioned one after the other it is possible to establish in which direction they have been crossed. If, for example, you place it at the entrance of the toilet then ...

German scientists claim to have broken the light-speed barrier, which could blow away the known limitations of modern networking, but the technology is unlikely to make it into a product--if at ...

The light barrier is in itself a relatively simple construction. Most of us are probably familiar with it from our physics lessons or from electronics kits, where the apparatus consists of a light ...