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  Pyramide - Volumenformel (Geometrie) - Rueff - YouTube

  https://www.youtube.com/watch?v=PSJAJpArvdo

  Mathematik / Geometrie: Anschaulich wird die Herleitung der Volumenformel für die Pyramide gezeigt.

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  Todd McGrain: The Lost Bird Project - YouTube

  https://www.youtube.com/watch?v=AALa4yfkIQo

  Sculptor Todd McGrain shares the inspiration for his Lost Bird Project during its installation at the National Museum of Wildlife Art in June 2013.

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