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technology the use of skills and tools to meet practical human needs. Old Stone Age the period of human prehistory that lasted until about 12,000 years ago, during which stone tools were the most common technology used by humans. hunter-gatherer a person of the Old Stone Age who met needs by hunting animals and gathering plants. Border Cave a major archaeological site in Zululand, South Africa and home of Old Stone Age hunters and gatherers. agriculture the raising of crops and animals for human use. New Stone Age the period of human prehistory that lasted from 12,000 years ago to about 6,000 years ago, during which people still depended mainly on stone tools and began experimenting with agriculture. domesticate to train plans or animals to be useful to people. surplus an extra supply of something, such as crops that are not needed immediately for food. specialization training to do a particular kind of work. civilization a culture that has developed systems of specialization, religion, learning, and government. trade the exchange of goods between people.