Snippet lesson plan: Historical evolution of views about the solar system and the retrograde motion of Mars using film clips from Agora and internet animations

@inproceedings{Stengler2013SnippetLP,
  title={Snippet lesson plan: Historical evolution of views about the solar system and the retrograde motion of Mars using film clips from Agora and internet animations},
  author={Erik. Stengler and James. Frieden},
  year={2013}
}