1. In Mexico and Central America, saddle querns are used to grind maize for tortillas.

2. Grain was placed on a slightly concave, horizontal stone surface, sometimes called a saddle-quern.

3. 21 In this storage there are home-made skis, a quern, a spinning wheel... but sometimes, in old houses you may find things of unknown to you purpose.

4. The grinder knelt in front of the fixed quern while grasping with both hands a smaller grinding stone, or rider, which was moved back and forth over the horizontal surface to grind the grain.

5. Studies of bone abnormalities in skeletons from ancient Syria have led paleontologists to conclude that operating similar querns caused young women repetitive stress injuries —notched kneecaps, damage to the last dorsal vertebra, and severe osteoarthritis in the big toe.