Conversation so far:
What is The Manhattan Project?
The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons.
When did The Manhattan Project begin?
The Manhattan Project began in 1942.
Did Joseph Rotblat work on The Manhattan Project with other people?
Joseph Rotblat worked in Egon Bretscher's group investigating high-energy gamma rays, and then with Robert R. Wilson's cyclotron group.
What kind of things did Joseph Rotblat do on the Manhattan Project?
Joseph Rotblat investigated whether high-energy gamma rays produced by nuclear fission would interfere with the nuclear chain reaction process.
Are there any other interesting aspects about Joseph Rotbalt on the Manhattan Project?
Joseph Rotblat continued to have strong reservations about the use of science to develop such a devastating weapon.
What did Joseph Rotblat do after he left the Manhattan Project?
Joseph Rotblat was accused of being a Soviet spy, and visiting someone in Santa Fe and leaving them a blank cheque to finance the formation of a communist cell.
Was Joseph Rotblat convicted and sent to prison for being an accused Soviet spy?
Joseph Rotblat was able to show that much of the information within the dossier had been fabricated.
Was Joseph Rotblat involved in any other controversies during The Manhattan Project?
What was the end result of The Manhattan Project?
The end result of the Manhattan project was the end of WWII, following the atomic bombings of Hiroshima and Nagasaki.

Question: Where did it take place?
Self-contained rewrite: Where did the bombings to end WWII take place?