Mathematics and medicine
An important Inca technology was the Quipu, which were assemblages of knotted strings used 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.
The Incas had no iron or steel, but they had developed an alloy of bronze superior to that of their enemies and contemporary Mesoamericans. The Andean nations prior to the Incas used arsenical bronze at best. The Incas introduced to South America the tin / copper alloy which is today commonly associated with "Bronze Age" metallurgy.
Rate and comment
