Defense minister Farhat Horchani said last week that German and American security experts were expected to come to help Tunisia devise a new electronic video-supervision system on its border with Libya.

Scientists have devised a way to determine roughly where a person has lived using a strand of hair, a technique that could help track the movements of criminal suspects or unidentified murdervictims.

Governments in developed nations devise and implement policy that changes consumer expectations.

In devising a way to assess hope scientifically, Doctor Snyder went beyond the simple notion that hope is merely the sense that everything will turn out all right.

Snyder, a psychologist, who has devised a scale to assess how much hope a person has.