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innovation invention RARE new knowledge builds on previous knowledge refinements (often accidental) first pottery hand-built then wheel then metal working (builds on pottery technology) diffusion (borrowing) Most common, 90% of content of cultures travel, trade, migration, conquest, communication Nina, Pinta and Santa Maria. 100% American by Ralph Linton. The spread of certain ideas, customs, or practices from one culture to another. culture loss if not needed, people forget. The abandonment of an existing practice or trait. acculturation massive change in a weaker group in contact with a stronger group because of military conquest also: colonialism tourism. population growth Adding 10,000 people/honor 1 million people 15 years 1850: first billion 1930: second billion 1970: four billion Now: over 7 billion resource use USA- 4.6% of world population, consume 25% world resources.