According to Medina (2014), the following are other important scientific ideas they
developed for food sustainability:
1. Due to the abundance of water and sunlight, as well as a temperate climate,
the chinampas were highly productive, producing up to four crops a year, and
about two-thirds of the food consumed in the city.
2. They grew maize, beans, tomatoes, pumpkins, chilis, flowers and medicinal herbs.
3. Aztecs disposed of all kinds of organic wastes in the chinampas, such as food
leftovers and agricultural residues, which fertilized the crops, an intensive recycling
of nutrients.
4. The most valuable fertilizer used on the chinampas was human excrement or
feces.
5. Human urine was used as a mordant (fixative) in the dyeing of fabrics, and, thus
also considered a resource.
6. Aztecs consumed animal protein from turkeys, ducks, deer, fish, and other wild
animals.
7. They also raised a breed of dog they called itzcuintli for human consumption,
feeding them food leftovers.
8. They have invented the canoe, a light narrow boat used for travelling in water
systems.
Astronomy
A new study on one of the most important remaining artifacts from the Aztec Empire, a
24-ton basalt calendar stone, interprets the stone’s central image as the death of the sun
god Tonatiuh during an eclipse, an event Aztecs believed would lead to a global
apocalypse accompanied by earthquakes. Many scientists believe the heart of the stone
to be the face of Tonatiuh (pronounced toe-NAH-tee-uh), atop which Aztecs offered
human sacrifices to stave off the end of the world. Researcher Susan Milbrath, a Latin
American art and archaeology curator at the Florida Museum of Natural History, offers
the new, ominous interpretation of this symbol in the February print edition of the journal
Mexicon. The Spanish buried the 12-foot-wide calendar stone, also known as the Sun
Stone, face down before it was uncovered in 1790. Aztecs and Mayas tracked the sun’s
movements to predict future events, such as weather patterns and astronomical cycles.
The Aztecs sacrificed a prisoner on the calendar stone on the date 4 Olin, the day they
believed the world would end. The day repeats every 260 days in their calendar cycle.
With succession of the cycle, another prisoner was sacrificed and the sun rose again the
following day and Tonatiuh lived on (Mavrakis, 2017).