The Inca used assemblages of knotted strings, known as Quipu to record information, the exact nature of which is no longer known. Originally it was thought that Quipu were used only as mnemonic devices or to record numerical data. Recent discoveries, however, have led to the theory that these devices were instead a form of writing in their own right.
The Inca made many discoveries in medicine. They performed successful skull surgery, which involved cutting holes in the skull in order to alleviate fluid buildup and inflammation caused by head wounds. Anthropologists have discovered evidence which suggests that most skull surgeries performed by Inca surgeons were successful. In pre-Inca times, only one-third of skull surgery patients survived the procedure. However, survival rates rose to 80-90% during the Inca era.
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