The term half-life describes how long it will take for half of the atoms to decay, and is constant for a given isotope. The curie the unit of measure used to describe the radioactivity of radioactive material. (1C = 3.7 X 1010 disintegrations/sec)
Maria Callas, 53, Is Dead of Heart Attack in Paris. By RAYMOND ERICSON. Maria Callas, the soprano whose intensely dramatic portrayals made her the most exciting opera singer of her time, died of a heart attack yesterday at her home in Paris. She was 53 years old.
Chavela Vargas died on August 5th. Read Benjamin Moser. Photograph by Marco Ugarte/AP Photo. When I was twenty-three, I found myself killing time in San JoaquÃ­n de Flores, Costa Rica. It was an unlikely place to look for Chavela Vargas, whose great age, famous affairs, and heartbreaking renditions of the Mexican classics made her one of the monuments of Latin America. Indeed, for the rich exoticism of the myths surrounding her life, no other singer came close.