"The Digestive System"- Encyclopedia Britannica (1965)

Please watch: "5BX "Five Basic Exercises"- Royal Canadian Air Force Training Film (1959)"
https://www.youtube.com/watch?v=NMGQzMjeO1k --~--
A very easy to understand documentary in the classic 60's style 16mm educationals of old, by Encyclopedia Britannica... They sure do not make em like this anymore!

Sources

  1. YouTube channel: Canada Day Archive · video ↗ — title, description, video