Overview: Scientists have long noted the universality of the size-weight illusion and formulated different hypotheses to explain it. Now new research suggests that this error may actually be an adaptation with roots in an important but sometimes overlooked aspect of human evolution: throwing skill. Author/Source: UC Museum of Paleontology Grade level: 13-16 Time: 15 minutes Teaching tips: This article includes a set of discussion and extension questions for use in class, as well as advanced discussion questions for undergraduates. It also includes hints about related lessons that might be used in conjunction with this one. Get more tips for using Evo in the News articles in your classroom. Concepts: Traits that confer an advantage may persist in the population and are called adaptations. Teacher background: Adaptation

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