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1676 – The acclaimed Danish astronomer Ole Rømer makes public the first quantitative measurements of the speed of light. 1789 – North Carolina ratifies the United States Constitution and is admitted as the 12th U.S. state. 1791 – French navigator Etienne Marchand reaches China after a record Pacific crossing of 60 days. 1877 – US…

In Ancient China, physicians held a different attitude to the principles of healthcare than now. What was it?