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The project was named the Manhattan Project.

Named this because its original offices (where the project originated) were in Manhattan.

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Leslie Richard Groves was chosen to be put in charge.

He, however, was a part of the military and didn't know about science.

They needed someone else to supervise the actual science about it.

They found Julius Robert Oppenheimer.

The pair was trying to find a good site to use.

They explored many areas and found “Los Alamos” in New Mexico.

They ended up buying this property.

The picture below is a view of Los Alamos in New Mexico.

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At Los Alamos, there were two types of atomic weapons being created:

One using an extremely rare isotope (kind) of Uranium.

The other one could also be produced using Plutonium.

This concept was a newer and more complicated design.

The picture below is what Uranium-235 looks like.

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After working for a long time, Oppenheimer was told they wouldn’t have enough Uranium for one bomb until mid 1945. This shows how rare it is.

The plutonium, however, was easier to get.

In mid March of 1945, Roosevelt was told that testing of the atomic bomb would most likely be ready by the summer.

Enough Uranium was produced.

The picture below is what Plutonium- 239 looks like

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On April 12, 1945, Pres. Roosevelt died.

Everyone working on the Manhattan project was extremely upset.

The same day, President Truman was sworn into office.

After about an hour of him becoming president, he was immediately told about the atomic bomb.

This means that the bomb was such a big secret the Vice President didn't even know of the atomic bomb.

Just about a month later, Germany surrendered from the war, ending the fighting in Europe.

The picture below is President Truman.