scientific ideas developed in the Inca Civilization
1. Roads paved with stones;
2. Stone buildings that surmounted earthquakes and other disaster;
3. Irrigation system and technique for storing water for their crops to grow in all types of land;
4. Calendar with 12 months to mark their religious festivals and prepare them for planting season;
5. The first suspension bridge;
6. Quipu, a system of knotted ropes to keep records that only experts can interpret; and
7. Inca textiles since cloth was one of the specially prized artistic achievements.