Actor David McCallum, shown in 1966, starred on the TV show ‘The Man from U.N.C.L.E.’ during the 1960s and later played eccentric medical examiner Dr. Donald ‘Ducky’ Mallard on ‘NCIS ...

Ever since they were invented in the 1960s, lasers have been seen as a potentially game-changing weapon. At first, it makes perfect sense. Lasers can cut through steel. They move at the speed of ...