Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Brilliant, disturbing and yet strangely optimistic

This is a highly detailed history of how the atomic bomb came to be. The characters are fleshed out and made to be real people. However I found the accounts of Hiroshima survivors almost unbearably difficult to read. Yet in the end I felt an strange optimism that one day we will unite as a planet, shed our petty differences and never again use this aweful weapon of total death.