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Answer: driving on the highway
It is the practice of driving in the highway that can be considered as an indicator of finally accepting social contract. Social contract refers to the agreement wherein individuals in all parties agreed to have a natural transfer of right.
People think the earth is flat because it seems hard to fathom that you can still stay on the earth if you're on the North Pole. This theory, that the earth is flat, was well known for hundreds of years. The vikings were the first to figure out that the earth is not flat, though Christopher Columbus gets the credit.
Hope this helps! Have a happy holiday!
Florence was the most famous. :)