For the study, the experts examined manos and metates uncovered from many ancient sites in the Western U.S. A mano was a stone tool that ancestors used to grind and pulverize food items.

A mano is a hand-held stone tool used with a metate to grind and pulverize food materials from plants and animals. The metate is a large, flat piece of stone or a depression ground into a bedrock ...

Indigenous women in Mexico still make mole sauce using ancient tools like the metate grinding stone. We visit chef Evangelina Aquino Luis of Nana Vira in Oaxaca to see how she makes her chichilo ...