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.
Maria Callas: Five great rumors on the soprano's 90th birthday. Soprano Maria Callas. Hard as it is to believe that an opera singer can make gossip headlines, Maria Callas was, in her prime, a media phenomenon whose personal life was fodder for journalists and chroniclers of high society. A symbol of jet-set elegance, Callas was a temperamental celebrity who had a fiery love life.