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Overview: Students discover the relationships among foot length, leg length, stride length and speed in bipedal animals that provide clues about dinosaur speed. Author/Source: UC Museum of Paleontology Grade level: 6-8 Time: Two to three class periods Concepts: Life forms of the past were in some ways very different from living forms of today, but in other ways very similar. Most species that once lived on Earth have gone extinct. Fossils provide evidence of past life. A hallmark of science is exposing ideas to testing. Scientists test their ideas using multiple lines of evidence. Scientific knowledge is open to question and revision as we come up with new ideas and discover new evidence. Scientists use multiple lines of evidence to study life over time. Scientists use fossils to learn about past life. Scientists use geological evidence to establish the age of fossils. There is a fit between the form of a trait and its function, though not always a perfect fit. Scientists use multiple research methods (experiments, observations, comparisons, and modeling) to collect evidence. Scientists can test ideas about events and processes long past, very distant, and not directly observable. Teacher background: Nature of Science

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