A young New York University student was thrown to the ground and attacked in a random broad daylight assault as she walked to class. Amelia Lewis, 20, was walking down Broadway in Manhattan on Monday ...

A laser is usually constructed from two basic elements: a material that provides optical gain through stimulated emission and an optical cavity that partially traps the light. When the total gain in ...

Ukrainian President Volodymyr Zelenskiy said on Tuesday Kyiv was discussing with Washington a possible presence of U.S. troops in Ukraine as part of security guarantees, and also raised what he called ...