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.
âThe Greekâ â Maria Callas. Cecilia Sofia Anna Maria Kalogeropoulou (1923 â 1977) was born in New York City of Greek immigrant parents. Shortly after she was born, her father shortened and Americanized the family name to Callas. As Maria Callas, she would become the most famous opera singer of her time and one of the most influential of all time. I described Caruso as a revolutionary in that he changed the way future tenors sang. After him, the public expected a different kind of singing.