State of the art, one of the seven wonders of the Ancient World, the great lighthouse of Alexandria, built around 280 B.C., towered some 450 feet above Egypt's greatest harbor. At that height, it was ...

Dr. Filip Sosnicki with a standard spatial Fresnel lens. Its temporal analogue was used in the conducted research (photo: Mirosław Kazmierczak, source: University of Warsaw). It is permissable to make ...

You may know them best for their original use in lighthouses, where they're famously recognised as "the invention that saved a million ships". Or perhaps you initially think of their employment in ...