the opinion that the four humors governed human physiology was “true” in the year AD 1000 since that is what everyone believed. In reality, the theory was never true; it was just popular. The consensus opinion is not necessarily true. Any person can analyze the dominant opinion, make contrary arguments, and seek to persuade others to abandon the consensus. The public square is the arena where objectivity thrives, but it does not guarantee the correct outcome of a debate. Many factors, such as institutional
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