Part 1 of 5 · freeIntroduction
A yawn looks trivial. In fact it is a complex reflex: jaw, chest, diaphragm, the whole body joins in. Lions, dogs, humans: plenty of animals yawn.
For a long time people said, “It's to get more oxygen.” That idea has now been largely dropped. The modern explanations are far more interesting.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2Not (mainly) about oxygen
- 3Why it is contagious
- 4We yawn before we are born
- 5Yawning to stay alert?
Open-book quiz8 questions whose answers are in the text.
Glossary11 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
