Cat's cradle

I've only read 30 pages but the title fits. A man the narrator is studying use to be able to make cats cradles with string. How the A-bomb was made would be a good title because the narrator is writing about the man man who created the a-bomb and interviews his family. The a-bomb after effects would also be a good title because the narrator interviews people about how they felt after the a-bomb was dropped on Hiroshima.