One of my friends grandmothers was an atomic bomb survivor - she was just a baby when the bomb hit and was blind the rest of her life.
One thing I was surprised by was the number of survivors and also that there was at least one person who survived both bombs [1]
The Wikipedia article says there were at least 165 survivors of both bombings: "[Yamaguchi] was invited to take part in a 2006 documentary about 165 double A-bomb survivors".
I, too, was shocked to learn this. I only learned about it fairly recently, from my older brother who read a book from the school library on it as a child:
Nine Who Survived Hiroshima & Nagasaki Hardcover – January 1, 1957
https://www.amazon.com/Nine-Who-Survived-Hiroshima-Nagasaki/...
> A resident of Nagasaki, Yamaguchi was in Hiroshima on business for his employer Mitsubishi Heavy Industries when the city was bombed at 8:15 AM, on 6 August 1945. He returned to Nagasaki the following day and, despite his wounds, returned to work on 9 August, the day of the second atomic bombing. That morning, while he was being told by his supervisor that he was "crazy" after describing how one bomb had destroyed the city, the Nagasaki bomb detonated.