Brain Tech Tutorial : Atomic Bomb II History II Brain Tech Tutorial

Sunday, 28 December 2025

Atomic Bomb II History II Brain Tech Tutorial

A short history of the Atomic Bomb

In 1939, physicists Albert Einstein and Leo Szilard drafted a letter to US President Franklin D. Roosevelt, urging him to research atomic bombs before the Germans could build one first. By 1942, the United States had approved the top-secret Manhattan Project to build a nuclear reactor and assemble an atomic bomb.

The begins with the 1938 discovery of nuclear fission, leading to the secret U.S.-led Manhattan Project during World War II, culminating in the July 1945 Trinity Test explosion in . The U.S. then used atomic bombs ("Little Boy" and "Fat Man") on Hiroshima (August 6, 1945) and Nagasaki (), Japan, causing immense destruction and leading to Japan's surrender, ending WWII. This ushered in the nuclear age, sparking an arms race with the Soviet Union and shaping global politics through the Cold War. [1, 2, 3, 4, 5, 6]

Key Developments:

Discovery of Fission (1938): German scientists Otto Hahn, Lise Meitner, and Fritz Strassman discovered nuclear fission, the splitting of atoms, releasing massive energy, making atomic weapons theoretically possible.
The Manhattan Project (1942-1946): The U.S. launched this top-secret program to build the bomb before Nazi Germany, involving top scientists like J. Robert Oppenheimer and led by General Leslie Groves.
Trinity Test (July 16, 1945): The first atomic device was detonated in New Mexico, proving the bomb's feasibility.
Hiroshima & Nagasaki (August 1945): The U.S. dropped uranium ("Little Boy") on Hiroshima and plutonium ("Fat Man") on Nagasaki, killing hundreds of thousands and forcing Japan's surrender, ending World War II. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Aftermath & Legacy:

Nuclear Age Begins: The bombings demonstrated unprecedented destructive power, forever changing warfare.
Arms Race: The Soviet Union developed its own bomb in 1949, starting a decades-long nuclear arms race during the Cold War.
Proliferation & Treaties: The threat of nuclear annihilation led to global efforts like the Non-Proliferation Treaty, though concerns remain with nations like North Korea developing nuclear capabilities. [4, 5, 7]

AI responses may include mistakes.

[1] https://www.britannica.com/technology/atomic-bomb

[2] https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki

[3] https://www.youtube.com/watch?v=BWk0oZQ7Zck

[4] https://www.history.com/articles/atomic-bomb-history

[5] https://www.youtube.com/watch?v=AZsngBRP8o0

[6] https://www.britannica.com/event/atomic-bombings-of-Hiroshima-and-Nagasaki

[7] https://www.nationalww2museum.org/war/articles/making-the-atomic-bomb-trinity-test

[8] https://www.icanw.org/hiroshima_and_nagasaki_bombings

[9] https://asiasociety.org/education/brief-history-nuclear-weapons-states

[10] https://www.youtube.com/watch?v=eGl7HQ3PmN4

August 6: What happened in Hiroshima today in 1945

History of Hiroshima Day

Hiroshima was founded in 1598 as a castle town on the Ōta River delta. Following the Meiji Restoration in 1868, Hiroshima rapidly transformed into a major urban center and industrial hub. In 1889, Hiroshima officially gained city status. The city was a center of military activities during the imperial era, playing significant roles such as in the First Sino-Japanese War, the Russo-Japanese War, and the two world wars. Hiroshima was the first city targeted by a nuclear weapon. This occurred on August 6, 1945 at 8:15 a.m., when the United States Army Air Forces (USAAF) dropped the atomic bomb "Little Boy" on the city. Most of the city was destroyed, and by the end of the year 90,000–166,000 had died as a result of the blast and its effects. The Hiroshima Peace Memorial (a UNESCO World Heritage Site) serves as a memorial of the bombing.