The crash also took the lives of the pilot and two other singers -- J.P.Richardson, known as the Big Bopper, and Ritchie Valens.

VOA: special.2009.04.06

Doctor Soerheim says they show that women suffered the same severity of C.O.P.D.as men.

VOA: special.2009.06.03

She says they show that women suffered the same severity of C.O.P.D.as men.

VOA: special.2009.06.23

Taro Aso,prime minister since last September, resigned as leader of the L.D.P.

VOA: special.2009.09.05

The new formulation is known as B.O.P.V., or bivalent oral polio vaccine.

VOA: special.2010.01.18