The Wheel |
Discovery of Fire |
The Automobile |
Airplane |
Electricity |
Anesthesia |
Compass |
Cotton Gin |
Democracy |
Mobile Phone |
Eye Glasses |
Glass |
Gun Powder |
Ink |
The Internet |
Light Bulb |
The Nail |
Oil Refining |
Computer |
Optical Fiber |
Paper |
Penicillin |
Prozac |
Radio |
Refrigeration |
Telephone |
Remote Controller |
The Printing Press |
The Steam Engine |
Transistor |
Television |
Video Tape |
Writing |
Assembly Line |
Chocolate |
Radar |
Abacus |
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