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.
Wreckage from Hurricane Maria in Arecibo, Puerto Rico, in September. Credit Victor J. Blue for The New York Times Facing mounting evidence that Puerto Rico has vastly undercounted the number of people who died because of Hurricane Maria, Gov. Ricardo A. RossellÃ³ ordered on Monday that every death on the island since the calamitous storm be reviewed.