In the 1960s and 70s, a group of chimpanzees astonished the world by learning sign language. Only two remain and one question still lingers—was it worth it?

An MIT alum developed a smartphone app that tracks Olympic figure skaters and snowboarders without sensors, to help coaches and NBC commentators.

OTTAWA — The federal justice department has widened its use of heat and motion sensors installed under staff’s desks, raising ...