WEST PALM BEACH, Fla. (AP) — Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, ...

Another mother, plagued by postpartum depression, leaps out of the building with her infant ... cut with absolute symmetry. That fact, in the days after Vincent’s death, seemed to have vanished ...

It wasn’t given its name until 1706, when Welsh mathematician William Jones ... that serves heating and air conditioning systems in buildings of various sizes. NASA uses pi on a daily basis.