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Manhattan Project: 20 Unknown Facts

The Manhattan Project, a top-secret U.S. government project during World War II, was a turning point in human history. It led to the development of the atomic bomb, forever changing the landscape of warfare and geopolitics. While the project is most famous for the bombings of Hiroshima and Nagasaki, there are many fascinating aspects that are less well-known. One such aspect is the “Demon Core,” a subcritical mass of plutonium that claimed the lives of scientists working on the project. In this blog post, we will delve into 20 fascinating facts about the Manhattan Project, its chronology, and the eerie story of the Demon Core and its victims.

Los Alamos Laboratory, Los Alamos, New Mexico
Los Alamos Laboratory, Los Alamos, New Mexico
  1. 1938: Discovery of Nuclear Fission
    German physicists Otto Hahn and Fritz Strassmann discovered nuclear fission, setting the stage for the Manhattan Project.
  2. 1939: Einstein’s Letter to Roosevelt
    Albert Einstein and Leo Szilard wrote a letter to President Franklin D. Roosevelt, warning about the potential of atomic weapons.
  3. 1941: Birth of the Manhattan Project
    The project officially started in 1941, although research had been ongoing since the late 1930s.
  4. 1942: Chicago Pile-1
    The first controlled nuclear chain reaction was achieved at the University of Chicago.
  5. 1943: Los Alamos Laboratory Established
    The primary research facility for the project was set up in Los Alamos, New Mexico.
  6. 1943: Robert Oppenheimer
    J. Robert Oppenheimer was appointed as the scientific director of the Manhattan Project.
  7. 1944: Oak Ridge and Hanford Sites
    Facilities in Oak Ridge, Tennessee, and Hanford, Washington, were established for uranium enrichment and plutonium production.
  8. 1945: Trinity Test
    The first successful test of an atomic bomb took place in New Mexico on July 16, 1945.
  9. 1945: Hiroshima and Nagasaki
    The atomic bombs were dropped on Hiroshima on August 6 and Nagasaki on August 9, 1945.
  10. 1945: End of World War II
    Japan surrendered on August 15, 1945, effectively ending World War II.
  11. 1945: Demon Core Created
    The Demon Core was a subcritical mass of plutonium created for a third bomb that was never used.
  12. 1945: Death of Harry Daghlian
    Physicist Harry Daghlian died due to accidental criticality while working with the Demon Core.
  13. 1946: Death of Louis Slotin
    Another physicist, Louis Slotin, died under similar circumstances while experimenting with the Demon Core.
  14. 1946: Operation Crossroads
    The first post-war atomic bomb tests were conducted at Bikini Atoll.
  15. 1947: National Security Act
    The Atomic Energy Commission was established to oversee nuclear research and development.
  16. 1950: Korean War and Atomic Diplomacy
    The Korean War reignited discussions about the use of atomic weapons.
  17. 1952: Hydrogen Bomb
    The first hydrogen bomb was successfully tested, marking another milestone in nuclear weaponry.
  18. 1963: Partial Test Ban Treaty
    The U.S., the Soviet Union, and the United Kingdom signed a treaty banning atmospheric nuclear tests.
  19. 1992: Last U.S. Nuclear Test
    The United States conducted its last nuclear test, signaling the end of an era.
  20. 2000s: Ongoing Legacy
    The Manhattan Project’s impact continues to be studied and debated, shaping policies and discussions on nuclear energy and weaponry.


The Manhattan Project was not just a scientific endeavor; it was a complex tapestry of politics, ethics, and human tragedy. The Demon Core and its victims serve as a grim reminder of the risks involved in pushing the boundaries of scientific knowledge. As we look back on the chronology and facts surrounding this monumental project, it’s crucial to remember both its achievements and its darker aspects. The legacy of the Manhattan Project continues to influence our world today, making it a subject worthy of ongoing exploration and understanding.

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