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 Franziska von Trapp, the last surviving sibling of the original singing von Trapp family whose story inspired The Sound of Music, has died in Vermont.She was 99 years old. A spokeswoman at the Trapp Family Lodge in Stowe, Vt., confirmed she died Tuesday.Maria had a wonderful life and we will miss her.aria Franziska was the last surviving member of the original seven von Trapp children. Oldest daughter Agathe von Trapp, the inspiration for Liesl in The Sound of Music, died in 2012 at the age of 97.