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How do you put 4.5 billion years into terms that young scholars can understand? Use your arms! Examine just how long our Earth has been around in a short video. The content includes the appearance of single-celled, then multicellular organisms, in Earth's more recent history. The narrator presents a very reproducible demonstration using the distance between his hands stretched wide.
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Instructional Ideas
- The versatile video works in a space science unit as well as an evolution unit
- Have pupils construct a timeline as the narrator presents the content, then compare it to a timeline showing different periods in Earth's history
Classroom Considerations
- Show younger scientists a diagram of when the organisms discussed in the video first appeared to help them relate
- This video is hosted on YouTube
Pros
- Illustrated organisms help the class trace the path of evolution over time
- The narrator's use of the span of his arms is simple and very relatable
Cons
- None