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Penicillin is a medicine that fought off infections.

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an antibiotic or group of antibiotics produced naturally by certain blue molds, and now usually prepared synthetically.

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A radar is a device that uses sound to track enemies down.

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a system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves that are reflected off the object back to the source.

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A enigma machine is a machine to create and send a secret messages.

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a small portable electro-mechanical rotor machine used to encrypt and decrypt secret messages, made famous by Germany in WWII.

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The atomic bomb  was the first weapon of destruction.

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a bomb which derives its destructive power from the rapid release of nuclear energy by fission of heavy atomic nuclei, causing damage through heat, blast, and radioactivity.