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What is this invention?
Penicillin
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Wheel
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Phonograph
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What is this invention?
Axe
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What is this invention?
Airplane
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What is this invention?
Fire
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Submarine
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What is this invention?
Compass
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What is this invention?
Smartphone
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What is this invention?
Computer
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What is this invention?
Paper
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What is this invention?
Wedge
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What is this invention?
Electronic Battery
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What is this invention?
Nuclear Energy
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What is this invention?
Doorknob
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What is this invention?
X-Rays
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What is this invention?
Radio
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What is this invention?
Satelite
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What is this invention?
Sewing Machine
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What is this invention?
Internet
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What is this invention?
Light Bulb
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What is this invention?
Screw
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What is this invention?
Telephone
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What is this invention?
Ramp
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