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Yawning Is a familiar thing that any of us do, especially when tired, even a fetus in the womb knows how to yawn. Yawning is very contagious, just look at other people.

1. The medical terminology of yawn is oscitation.

Key Facts About Interesting Facts

2. Most of the world's vertebrate animals yawn, including humans, dogs, chimpanzees and other animals.

3. Yawning is contagious, you can yawn as soon as you hear the word ". Yawn " as well as when you see or hear others yawning, you can yawn.

4. What makes us yawn? This is one of the everyday mysteries that scientists have failed to find a convincing solution.

5. When a person in the group yawned, more than half of the group will yawn within 5 minutes and the rest will at least be tempted to yawn.

6. The 11-week-old fetus in the womb is already yawning.

7. Men's yawning time is often longer than that of women.

8. The average time of yawning is about 6 seconds.

Why Interesting Facts Matters

9. Heart rate always increased significantly during a yawn.

10. Yawning occurs when there is too much carbon dioxide (CO2) in the blood.

11. The higher the concentration of serotonin, glutamic acid and dopamine in the brain, the more we yawn. The higher the concentration of endorphins, the less we yawn.

12. Yawning has no side effects.

13. Dogs can yawn when they see people yawning and in cases of emotional instability.

14. 55% of us will stop yawning for 5 minutes after seeing others yawn.

15. Blind people will yawn more when they hear yawn or hear directly in a tape.

See also: 21 interesting facts about the human body not everyone knows.

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