Which military product development program during WWII was code-named 'Manhattan Project' and fundamentally changed both warfare and civilian technology development?

Throughout history, military innovations have often driven technological advances that later benefited civilian life. From radar to GPS, military product development has shaped our modern world. This trivia question focuses on a pivotal moment in military product development during World War II that revolutionized both warfare and later influenced countless civilian technologies. Test your knowledge of how military necessity drove one of the most significant product innovations of the 20th century.

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The atomic bomb development program
The radar detection system program
The jet engine propulsion program
The penicillin mass production program