The Inca developed important medical practices, including surgery on the human skull. In such operations, they cleaned the area to be operated on and then gave the patient a drug to make him or her unconscious—procedures similar to the modern use of antiseptics and anesthesia.
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The main reason why this was the case during the Renaissance was because art collection was a luxury, in that it required a lot of money. This made it advantageous for only the rich people to support it fully.