B1 · 5 minutes · Science

Why we yawn

A short explainer talk about a habit everyone has.

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What you’ll practise

Follow a simple explanation with reasons and examples.

Words to know

yawn: To open your mouth wide and breathe in, usually when tired.
contagious: Easily passed from one person to another.
theory: An idea that tries to explain something.

Words at this lesson’s level (B1)

At B1, you probably know about 90% of the words in this lesson.

The other words of this lesson are at B1 or below.

Word levels from the CEFR-J Wordlist 1.5 (Yukio Tono, Tokyo University of Foreign Studies); words not in it count as above B2. Your level is the one you chose in the level guide, otherwise the lesson’s.

Source

Original exercise by Joy English. Synthetic voice: Kokoro-82M (Apache-2.0).

Original script; synthetic narration.

Levels are suggestions. Found a mistake? Tell us through the Contact page.