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Yooniq images - Aztec civilization, Mexico, 15th century. Ceremonial knife.

Yooniq images - Aztec civilization, Mexico, 15th century. Ceremonial knife.

More than 200 animals of 19 different species march across the handle of this knife, which was crafted from flint and elephant ivory, sometime between 3300 and 3100 B.C., during Egypt's Predynastic Period. A group of scientists drew from artifacts like this one to understand patterns of species extinction over about 6,000 years of Egypt's history. Credit: Brooklyn Museum, Charles Edwin Wilbour Fund

Climate and Civilization Killed Egypt's Animals

By looking at images of animals in Egypt's archaeological record, scientists found that most extinctions over the last years were linked to periods of big change in terms of climate and human civilization.

Large Aztec biface 24 1/4 inches long.  This extraordinarily large biface is one of the most skillfully made examples in the world and is a testimony to the highly skilled Aztec "flint smiths" of Pre-Columbian Mexico.  There are no more than a handful of flintknappers today that would be able to duplicate this large ceremonial knife. But the difficultly today, just as it must have been for the Aztec craftsmen, was the availability of material big enough to make bifaces this large.

Large Biface Ceremonial Knife, Aztec, this extraordinarily large biface is inches long and one of the most skillfully made examples in the world.

Celt Date: 10th–4th century B.C. Geography: Mexico, Mesoamerica Culture: Olmec Medium: Jade

Celt Date: century BCE Geography: Mexico, Mesoamerica Culture: Olmec Medium: Jade

Sacrificial Knife with Mosaic Handle and Chalcedony Blade, Mexica*/Mixtec, 15th-16th century C.E., from Mexico, cedrela wood, wood, turquoise, resin, oyster shell, malachite, chalcedony,  31.7 cm long © Trustees of the British Museum

Sacrificial Knife with Mosaic Handle and Chalcedony Blade (article .

Flint Aztec sacrificial knife with carved wooden handle at the National Museum of Anthropology in Mexico City

Flint Aztec sacrificial knife with carved wooden handle at the National Museum of Anthropology in Mexico City

THE AZTECS

The Aztecs, ancient cultures medicines and beliefs, the history of the Aztec Empire.

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