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[[Image:Fat-Man.jpg|right|thumb|A replica of the ''Fat Man''.|300px]]
The '''Manhattan Project''' was a 6-year effort to develop a nuclear [[fission]] weapon before the [[Nazi]]s could, sparked by a warning from European scientists to US [[President Roosevelt]].
The '''Manhattan Project''' was a 6-year effort to develop a nuclear [[fission]] weapon before the [[Nazi]]s could, sparked by a warning from European scientists to US [[President Roosevelt]].