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For most of us, science arrives in our lives packaged neatly as fact. But how did it get that way? Science is an active process of observation and investigation. Evidence: How Do We Know What We Know? examines that process, revealing the ways in which ideas and information become knowledge and understanding. a case study in human origins In this case study in human origins, we explore how scientific evidence is being used to shape our current understanding of ourselves: What makes us human-and how did we get this way?