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How come people do not know the difference between "invention" and "discovery"? Electricity, fire, and sticks were not invented, they were discovered. If you counted discoveries you would have to say food before electricity.
So for the greatest invention I will list several as they are equally, or almost equally, important:
Wheel
Computers
Telephone
Plastic (as someone mentioned above; almost all food is stored in plastic; medicine, etc.)
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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