2. Chocolate: The Aztecs were the first people to cultivate and process chocolate. They made a drink from chocolate that they believed had divine properties.
3. Rubber: The Aztecs discovered the process of vulcanizing rubber, which made it more durable and waterproof. They used rubber to make balls and other objects.
4. Calendar: The Aztec calendar was a complex and accurate system of timekeeping. It was based on both solar and lunar cycles and was used to predict astronomical events, such as eclipses.