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But in kitchens throughout the world, there's one piece of technology that's been the same since the Stone Age: the mortar and pestle. The mortar and pestle is one of the most primitive kitchen tools.

writes in an article he published in the Bulletin of Primitive Technology. To spend a day with Kidder on one of his Stone Age educational outings is to learn how that idea can be challenged.

Primitive Industry, or, Illustrations of the Handiwork in Stone, Bone, and Clay of the Native Races of the Northern Atlantic Seaboard of America. By Charles C. Abbott (Salem, Mass.: George A.