This morning, japan has marked 75 years since the unleashing of the worlds first atomic bomb on hiroshima. 140,000 people were killed, nearly half the citys population. A scaledback, social distancing event was held with survivors and relatives marking the 8 15 a. M. Blast anniversary with a moment of silence. This morning, were opening up the abc news vault to august 1995, the 50th anniversary, with abcs carole simpson. 4,000 americans were there the day the bomb fell. Only 1,000 of them came home. Abcs deborah amos looks at how two of them are faring today. Reporter every other year, for nearly 20 years, kay yoshioka and jack diruike spend a day in a San Francisco clinic where a team of visiting japanese specialists check for cancer, blood diseases, and anything else that might be traced to what happened 50 years ago. Kay was 8 years old then, americanborn, but living in japan because her family had moved back to care for her grandmother. That summer, with american planes firebombing