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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?

Dig into the science of making things grow

Your age on other planets..."Looking at the numbers above, you'll immediately notice that you are different ages on the different planets. This brings up the question of how we define the time intervals we measure. What is a day? What is a year?"

Journey into Chaco Canyon, where ancient people built monuments to the cosmos.